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Uses
and Limitations of Dynamic Geometry
and Computer Algebra in the
Analysis of the Shrinking Circle
Problem
ACMS Biennial Conference,
Messiah College
1 June 2007
Shrinking Circle Problem
•Let
<=
/div>
•<=
/span>C be t=
he unit
circle with center (1,0)
<=
/span>
•<=
/span>Cr be the circle with radius <=
span
style=3D'font-size:88%'>r and =
center (0,0)
•<=
/span>P be t=
he point
(0, r)
•<=
/span>Q be t=
he upper
point of intersection of C and C=
r
•<=
/span>R be t=
he
intersection of the line PQ and the x=
-axis.
•
•What happens to <=
span
style=3D'font-size:88%'>R as <=
/span>Cr shrinks to the origin?
=
•
<=
span
style=3D'mso-special-format:nobullet;display:none'>•Stewart, E=
ssential
Calculus: Early Transcendentals,<=
br>
Thomson Brooks/Cole,
2007, p. 45, Exercise 56.
Visualization
![](3D"slide0003_image002.jpg")
![](3D"slide0003_image003.gif")
Proofs
•Numeric
Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
![](3D"slide0006_image010.gif")
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Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
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Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
the origin: (x − a=
)2 + (y − b)2 =3D a2 + b2. Let C=
r ,
P, Q, and R be defined as in the
Generalized Shrinking Circle Problem.
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Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
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Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
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------=_NextPart_01C7A94C.ACFDEEC0
Content-Location: file:///C:/ECBAB22B/ACMS2007-Shrink_files/script.js
Content-Transfer-Encoding: quoted-printable
Content-Type: application/javascript; charset="us-ascii"
function LoadSld()
{
var sld=3DGetObj("SlideObj")
if( !g_supportsPPTHTML ) { =09
sld.style.visibility=3D"visible"
return
}
if( MakeNotesVis() ) return
runAnimations =3D _InitAnimations();
=09
if( IsWin("PPTSld") )
parent.SldUpdated(GetSldId())
g_origSz=3DparseInt(SlideObj.style.fontSize)
g_origH=3Dsld.style.posHeight
g_origW=3Dsld.style.posWidth
g_scaleHyperlinks=3D(document.all.tags("AREA").length>0)
if( g_scaleHyperlinks )
InitHLinkArray()
if( g_scaleInFrame||(IsWin("PPTSld") && parent.IsFullScrMode() ) )
document.body.scroll=3D"no"
_RSW()
if( IsWin("PPTSld") && parent.IsFullScrMode() )
FullScrInit();
=09
MakeSldVis();
ChkAutoAdv()
if( runAnimations )
{
if( document.all("NSPlay") )
document.all("NSPlay").autoStart =3D false;
if( sld.filters && sld.filters.revealtrans )
setTimeout( "document.body.start()", sld.filters.revealtrans.duration * =
1000 );
else
document.body.start();
}
}
function MakeSldVis()=20
{
var fTrans=3Dg_showAnimation && SldHasTrans()
if( fTrans )=09
{
if( g_bgSound ) {
idx=3Dg_bgSound.indexOf(",");
pptSound.src=3Dg_bgSound.substr( 0, idx );
pptSound.loop=3D -(parseInt(g_bgSound.substr(idx+1)));
}
SlideObj.filters.revealtrans.Apply()=09
}
SlideObj.style.visibility=3D"visible"
if( fTrans )
SlideObj.filters.revealtrans.Play()
}
function MakeNotesVis()=20
{
if( !IsNts() ) return false=20
SlideObj.style.display=3D"none"
nObj =3D document.all.item("NotesObj")
parent.SetHasNts(0)
if( nObj ) {=20
nObj.style.display=3D""
parent.SetHasNts(1)
}
return 1
}
function ChkAutoAdv()
{
if(SldHasTrans())
SlideObj.onfilterchange=3DAutoAdv
else
AutoAdv()
}
function AutoAdv()
{
if(!IsWin("PPTSld") || !gUseSldTimings )return
var sld=3DGetCurSld()
if( (sld.mAdvDelay>0) && !parent.IsFramesMode() )
setTimeout("parent.GoToNextSld()",sld.mAdvDelay)
}
function GetObj(id)
{
if(g_supportsPPTHTML) return document.all(id);
else return document.getElementById(id);
}
function SldHasTrans() { return SlideObj.style.filter !=3D ""; }
function GetSldId() { return sId=3Dlocation.href.substring(location.href.la=
stIndexOf('/')+1) }
function HideMenu() { if( frames["PPTSld"] && PPTSld.document.all.item("ctx=
tmenu") && PPTSld.ctxtmenu.style.display!=3D"none" ) { PPTSld.ctxtmenu.styl=
e.display=3D'none'; return true } return false }
function IsWin( name ) { return window.name =3D=3D name }
function IsNts() { return IsWin("PPTNts") }
function IsSldOrNts() { return( IsWin("PPTSld")||IsWin("PPTNts") ) }
function SupportsPPTAnimation() { return( navigator.platform =3D=3D "Win32"=
&& navigator.appVersion.indexOf("Windows")>0 ) }
function SupportsPPTHTML()
{
var appVer=3Dnavigator.appVersion, msie=3DappVer.indexOf("MSIE "), ver=3D0
if( msie >=3D 0 )
ver=3DparseFloat( appVer.substring( msie+5, appVer.indexOf(";",msie) ) )
else
ver=3DparseInt(appVer)
return( ver >=3D 4 && msie >=3D 0 )
}
function _RSW()
{
if( !g_supportsPPTHTML || IsNts() ||
( !g_scaleInFrame && (!IsWin("PPTSld") || !parent.IsFullScrMode()) ) )
return
var padding=3D0;
if( IsWin("PPTSld") && parent.IsFramesMode() ) padding=3D6
cltWidth=3Ddocument.body.clientWidth-padding
cltHeight=3Ddocument.body.clientHeight-padding
factor=3D(1.0*cltWidth)/g_origW
if( cltHeight < g_origH*factor )
factor=3D(1.0*cltHeight)/g_origH
newSize =3D g_origSz * factor
if( newSize < 1 ) newSize=3D1
s=3DSlideObj.style
s.fontSize=3DnewSize+"px"
s.posWidth=3Dg_origW*factor
s.posHeight=3Dg_origH*factor
s.posLeft=3D(cltWidth-s.posWidth+padding)/2
s.posTop=3D(cltHeight-s.posHeight+padding)/2
if( g_scaleHyperlinks )
ScaleHyperlinks( factor )
}
function _InitAnimations()
{
animRuntimeInstalled =3D ''+document.body.localTime !=3D 'undefined';
isFullScreen =3D (window.name =3D=3D "PPTSld") && !parent.IsFramesMode();
g_animUseRuntime =3D g_showAnimation && animRuntimeInstalled && !(isFullSc=
reen && parent.IsSldVisited());
if( g_animUseRuntime ) {
collSeq =3D document.all.tags("seq");
if( collSeq !=3D null ) {
for(ii=3D0;ii numSlds )
gSldJumpIdx =3D numSlds;
if ( gSldJumpIdx >=3D 0 ) {
if ( gSldJumpIdx =3D=3D 0 )
gSldJumpIdx =3D 1;
var jumpTo =3D parseInt(gSldJumpIdx);
gSldJump =3D 0; gSldJumpIdx =3D "";
win.GoToSld( parent.GetSldList().mList[jumpTo-1].mSldHref )
}
}
}
function _KDH()
{
if( event.keyCode =3D=3D 8 ) {
event.returnValue =3D 0;
parent.GoToPrevSld();
}
}
var g_HLinkArray =3D new Array();
=20
function IMapAreaObj( areaObj, coords )
{
this.areaObj =3D areaObj;
this.coords =3D coords;
}
function InitHLinkArray()
{
var appVer =3D navigator.appVersion;
var msie =3D appVer.indexOf ( "MSIE " )
var ver =3D 0;
if ( msie >=3D 0 )
ver =3D parseInt ( appVer.substring( msie+5 ) );
linkNum =3D 0;
for (i=3D0; i 4 ) )
g_HLinkArray[linkNum++] =3D new IMapAreaObj( areaObj, ParseCoords( ar=
eaObj.coords ) );
}
}
function ScaleHyperlinks( factor )
{ =20
for ( ii=3D0; ii< g_HLinkArray.length; ii++) {
coordsStr=3D"";
imaObj =3D g_HLinkArray[ii];
for ( jj=3D0; jj < imaObj.coords.length-1; jj++ )
coordsStr +=3D (imaObj.coords[jj]*factor) + ",";
coordsStr +=3D (imaObj.coords[jj]*factor);
imaObj.areaObj.coords =3D coordsStr;
}
}
function ParseCoords( coordsStr )
{
var numArray =3D new Array();
var i =3D curPos =3D commaPos =3D 0;
while ( ( commaPos =3D coordsStr.indexOf(",", curPos) ) !=3D -1 ) {=20
numArray[i++] =3D parseInt( coordsStr.substr( curPos, commaPos ) );
curPos =3D commaPos + 1;
}
numArray[i] =3D parseInt( coordsStr.substr( curPos ) );
return numArray;
}
function DocumentOnClick()
{
if( IsNts() || parent.HideMenu() ) return;
if( ( g_allowAdvOnClick && !parent.IsFramesMode() ) ||
(event && (event.keyCode=3D=3D32) ) )
parent.GoToNextSld();
}
var g_supportsPPTHTML =3D SupportsPPTHTML(), g_scaleInFrame =3D 1, gId=3D""=
, g_bgSound=3D"",
g_scaleHyperlinks =3D false, g_allowAdvOnClick =3D 1, g_showInBrowser =
=3D 0, gLoopCont =3D 0, gUseSldTimings =3D 1;
var g_showAnimation =3D g_supportsPPTHTML && SupportsPPTAnimation() && ( (w=
indow.name=3D=3D"PPTSld" && !parent.IsFramesMode()) || g_showInBrowser );va=
r g_animManager =3D null;
var g_animUseRuntime =3D false;
var g_animItemsToHide, g_animInteractiveItems, g_animSlideTime;
var g_animMainSequence =3D null;
var ENDSHOW_MESG=3D"End of slide show, click to exit.", SCREEN_MODE=3D"Fram=
es", gIsEndShow=3D0, NUM_VIS_SLDS=3D10, SCRIPT_HREF=3D"script.js", FULLSCR_=
HREF=3D"fullscreen.htm";
var gCurSld =3D gPrevSld =3D 1, g_offset =3D 0, gNtsOpen =3D gHasNts =3D gO=
tlTxtExp =3D 0, gHasNarration =3D 0, gOtlOpen =3D true
window.gPPTHTML=3DSupportsPPTHTML()
var gMainDoc=3Dnew Array(new hrefList("slide0001.htm",1,-1,1),new hrefList(=
"slide0002.htm",1,-1,1),new hrefList("slide0003.htm",1,-1,1),new hrefList("=
slide0005.htm",1,-1,1),new hrefList("slide0006.htm",1,-1,1),new hrefList("s=
lide0010.htm",1,-1,1),new hrefList("slide0007.htm",1,-1,1),new hrefList("sl=
ide0008.htm",1,-1,1),new hrefList("slide0009.htm",1,-1,1),new hrefList("sli=
de0011.htm",1,-1,1));
/*********************************************
Frameset functions
These functions control slide navigation
and state of the frameset.
**********************************************/
function FullScrInit()
{
g_allowAdvOnClick =3D GetCurSld().mAdvOnClk
document.body.style.backgroundColor=3D"black"
document.oncontextmenu=3Dparent._CM;
document.onkeydown =3D _KDH;
document.ondragstart=3DCancel
document.onselectstart=3DCancel
self.focus()
}
function Redirect( frmId )
{=09
var str=3Ddocument.location.hash,idx=3Dstr.indexOf('#'), sId=3DGetSldId()
if(idx>=3D0) str=3Dstr.substr(1);
if( window.name !=3D frmId && ( sId !=3D str) ) {
obj =3D GetObj("Main-File")
window.location.href=3Dobj.href+"#"+sId
return 1
}
return 0
}
var MHTMLPrefix =3D CalculateMHTMLPrefix();=20
function CalculateMHTMLPrefix()
{
if ( document.location.protocol =3D=3D 'mhtml:') {=20
href=3Dnew String(document.location.href)=20
Start=3Dhref.indexOf('!')+1=20
End=3Dhref.lastIndexOf('/')+1=20
if (End < Start)=20
return href.substring(0, Start)=20
else=20
return href.substring(0, End)=20
}
return '';
}
function GetTags(base,tag)
{
if(g_supportsPPTHTML) return base.all.tags(tag);
else return base.getElementsByTagName(tag);
}
function UpdNtsPane(){ if(frames["PPTNts"]) PPTNts.location.replace( MHTMLP=
refix+GetHrefObj( gCurSld ).mNtsHref ) }
function UpdNavPane( sldIndex ){ if(gNavLoaded) PPTNav.UpdNav() }
function UpdOtNavPane(){ if(gOtlNavLoaded) PPTOtlNav.UpdOtlNav() }
function UpdOtlPane(){ if(gOtlLoaded) PPTOtl.UpdOtl() }
function SetHasNts( fVal )
{
if( gHasNts !=3D fVal ) {
gHasNts=3DfVal
UpdNavPane()
}
}
function ToggleOtlText()
{
gOtlTxtExp=3D!gOtlTxtExp
UpdOtlPane()
}
function ClearMedia()
{
// Clear any sounds playing before launching another browser window. Other=
wise,
// in fullscreen mode, you'll continue to hear the sound in the frames mod=
e.
if (PPTSld.pptSound) PPTSld.pptSound.loop =3D 0;
}
function FullScreen()
{=20
if ( PPTSld.g_animUseRuntime )
PPTSld.document.body.pause();
ClearMedia();
var href =3D ( document.location.protocol =3D=3D 'mhtml:') ? FULLSCR_HREF =
: FULLSCR_HREF+"#"+GetHrefObj(gCurSld).mSldHref;
if(PPTNav.event.ctrlKey) {
var w =3D (window.screen.availWidth * 1.0) / 2.0
var h =3D w * (PPTSld.g_origH * 1.0) / PPTSld.g_origW
win =3D window.open( MHTMLPrefix+href,null,"toolbar=3D0,resizable=3D1,top=
=3D0,left=3D0," + "width=3D"+ w + ",height=3D" + h );
if( win.document.body && PPTSld.g_animUseRuntime )
win.document.body.PPTSldFrameset=3Dwindow;
}
else
{
win =3D window.open( MHTMLPrefix+href,null,"fullscreen=3Dyes" );
if( win.document.body && PPTSld.g_animUseRuntime )
win.document.body.PPTSldFrameset=3Dwindow;
}
}
function ToggleVNarration()
{
rObj=3DPPTSld.document.all("NSPlay")
if( rObj && !PPTSld.g_animUseRuntime ) {
if( (rObj.playState =3D=3D 1)||(rObj.playState =3D=3D 0) )
rObj.Play()
else if( rObj.playState =3D=3D 2 )
rObj.Pause()
else
return;
}
else if( PPTSld.g_animUseRuntime )
{
narObj =3D PPTSld.document.all("narrationID")
if( narObj )
narObj.togglePause()
}
}
function GetCurSldNum()
{ =20
obj=3DGetHrefObj(gCurSld)
if( obj.mOrigVis =3D=3D 1 )
return obj.mSldIdx
else =20
return gCurSld
}
function GetNumSlds()
{ =20
if( GetHrefObj(gCurSld).mOrigVis =3D=3D 1 )
return GetSldList().mNumVisSlds;
else
return GetSldList().mList.length
}
function GetSldNum( href )
{
for(ii=3D0; ii 1 )
PopSldList();
else if( !IsFramesMode() ) {
if( gLoopCont )
GoToFirst()
else
EndShow()
}
}
function GoToPrevSld()
{
ii=3DgCurSld-1
if( ii > 0 ) {
obj=3DGetHrefObj(ii)
while ( obj && ( obj.mVis =3D=3D 0 ) && ( ii>0 ) )
obj=3DGetHrefObj(--ii)
if( ii =3D=3D 0 ) ii=3D1
GoToSldNum(ii)
}
}
function GoToFirst(){ GoToSld( GetHrefObj(1).mSldHref ) }
function GoToLast()
{
ii=3DGetSldList().mList.length
if( ii !=3D gCurSld )
GoToSld( GetHrefObj(ii).mSldHref )
}
function GoToSldNum( num )
{
if( PPTSld.event ) PPTSld.event.cancelBubble=3Dtrue
obj =3D GetHrefObj( num )
obj.mVis=3D1
gPrevSld=3DgCurSld
gCurSld =3D num;
PPTSld.location.replace(MHTMLPrefix+obj.mSldHref)
if( IsFramesMode() ) {
UpdNavPane(); UpdOtlPane(); UpdNtsPane()
}
}
function GoToSld( href )
{
if( PPTSld.event ) PPTSld.event.cancelBubble=3Dtrue
GetHrefObj( GetSldNum(href) ).mVis=3D1
PPTSld.location.replace(MHTMLPrefix+href)
}
function SldUpdated( id )
{
if( id =3D=3D GetHrefObj(gCurSld).mSldHref ) return
gPrevSld=3DgCurSld
gCurSld=3DGetSldNum(id)
if( IsFramesMode() ) {
UpdNavPane(); UpdOtlPane(); UpdNtsPane()
}
}
function PrevSldViewed(){ GoToSld( GetHrefObj(gPrevSld).mSldHref ) }
function HasPrevSld() { return ( gIsEndShow || ( gCurSld !=3D 1 && GetHrefO=
bj( gCurSld-1 ).mVis =3D=3D 1 )||( GetCurSldNum() > 1 ) ) }
function HasNextSld() { return (GetCurSldNum() !=3D GetNumSlds()) }
function CloseWindow() {
if( HideMenu() ) return;
=09
var event =3D PPTSld.event;
if( !IsFramesMode() && event && (event.keyCode=3D=3D27 || event.keyCode=3D=
=3D32 || event.type=3D=3D"click" ) )
window.close( self );
CatchNumKeys( self, event );
}
function Unload() { gIsEndShow=3D0; }
function SetupEndShow() {
gIsEndShow=3D1;
PPTSld.document.body.scroll=3D"no";
PPTSld.document.onkeypress=3DCloseWindow;
PPTSld.document.onclick=3DCloseWindow;
PPTSld.document.oncontextmenu=3D_CM;
}
function EndShow()
{
if( IsFramesMode() ) return
if( PPTSld.event ) PPTSld.event.cancelBubble=3Dtrue
doc=3DPPTSld.document
var dir =3D doc.body.dir
if( dir !=3D "rtl" ) dir =3D "ltr";
doc.open()
doc.writeln(' 0) {
PushSldList(sldList,fEnd);
gCurSld =3D 1;
}
else
if( PPTSld.event ) PPTSld.event.cancelBubble=3Dtrue
}
function PushSldList(arr,fEnd) {
var ii =3D gSldStack.length;
gSldStack[ii] =3D new SldList(arr,gCurSld,fEnd);
GoToSld( gSldStack[ii].mList[0].mSldHref );
}
function PopSldList() {
if (gSldStack[gSldStack.length-1].fEndShow)
EndShow()
else {
gCurSld =3D gSldStack[gSldStack.length-1].mCurSld;
gSldStack[gSldStack.length-1] =3D null;
gSldStack.length--;
var sldList =3D gSldStack[gSldStack.length-1];
GoToSld( sldList.mList[gCurSld - 1].mSldHref );
}
}
var custShowList=3Dnew Array();
/*********************************************
Navigation button implementation
There are 2 types of buttons: ImgBtn, TxtBtn
implemented as function objects. They share
a similiar interface so the event handlers
can call SetActive, for example, on a button=20
object without needing to know exactly=20
what type of button it is.
**********************************************/
//----------------------------------
function ImgBtn( oId,bId,w,action )
//----------------------------------
{
var t=3Dthis
t.Perform =3D _IBP
t.SetActive =3D _IBSetA
t.SetInactive=3D _IBSetI
t.SetPressed =3D _IBSetP
t.SetDisabled=3D _IBSetD
t.Enabled =3D _IBSetE
t.ChangeIcon =3D null
t.UserAction =3D action
t.ChgState =3D _IBUI
t.mObjId =3D oId
t.mBorderId=3D bId
t.mWidth =3D w
t.mIsOn =3D t.mCurState =3D 0
}
function _IBSetA()
{
if( this.mIsOn ) {
obj=3Dthis.ChgState( gHiliteClr,gShadowClr,2 )
obj.style.posTop=3D0
}
}
function _IBSetI()
{
if( this.mIsOn ) {
obj=3Dthis.ChgState( gFaceClr,gFaceClr,1 )
obj.style.posTop=3D0=20
}
}
function _IBSetP()
{
if( this.mIsOn ) {
obj=3Dthis.ChgState( gShadowClr,gHiliteClr,2 )
obj.style.posLeft+=3D1; obj.style.posTop+=3D1
}
}
function _IBSetD()
{ =20
obj=3Dthis.ChgState( gFaceClr,gFaceClr,0 )
obj.style.posTop=3D0=20
}
function _IBSetE( state )
{
var t=3Dthis
GetObj( t.mBorderId ).style.visibility=3D"visible"
if( state !=3D t.mIsOn ) {
t.mIsOn=3Dstate
if( state )
t.SetInactive()
else
t.SetDisabled()
}
}
function _IBP()
{
var t=3Dthis
if( t.mIsOn ) {
if( t.UserAction !=3D null )
t.UserAction()
if( t.ChangeIcon ) {
obj=3DGetObj(t.mObjId)
if( t.ChangeIcon() )
obj.style.posLeft=3Dobj.style.posLeft+(t.mCurState-4)*t.mWidth
else
obj.style.posLeft=3Dobj.style.posLeft+(t.mCurState-0)*t.mWidth
}
t.SetActive()
} =20
}
function _IBUI( clr1,clr2,nextState )
{
var t=3Dthis
SetBorder( GetObj( t.mBorderId ),clr1,clr2 )
obj=3DGetObj( t.mObjId )
obj.style.posLeft=3Dobj.style.posLeft+(t.mCurState-nextState)*t.mWidth-obj=
.style.posTop
t.mCurState=3DnextState
return obj
}
//-----------------------------------------
function TxtBtn( oId,oeId,action,chkState )
//-----------------------------------------
{
var t=3Dthis
t.Perform =3D _TBP
t.SetActive =3D _TBSetA
t.SetInactive=3D _TBSetI
t.SetPressed =3D _TBSetP
t.SetDisabled=3D _TBSetD
t.SetEnabled =3D _TBSetE
t.GetState =3D chkState
t.UserAction =3D action
t.ChgState =3D _TBUI
t.mObjId =3D oId
t.m_elementsId=3D oeId
t.mIsOn =3D 1
}
function _TBSetA()
{
var t=3Dthis
if( t.mIsOn && !t.GetState() )
t.ChgState( gHiliteClr,gShadowClr,0,0 )
}
function _TBSetI()
{
var t=3Dthis
if( t.mIsOn && !t.GetState() )
t.ChgState( gFaceClr,gFaceClr,0,0 )
}
function _TBSetP()
{
if( this.mIsOn )
this.ChgState( gShadowClr,gHiliteClr,1,1 )
}
function _TBSetD()
{ =20
this.ChgState( gFaceClr,gFaceClr,0,0 )
this.mIsOn =3D 0
}
function _TBSetE()
{
var t=3Dthis
if( !t.GetState() )
t.ChgState( gFaceClr,gFaceClr,0,0 )
else
t.ChgState( gShadowClr,gHiliteClr,1,1 )
t.mIsOn =3D 1
}
function _TBP()
{
var t=3Dthis
if( t.mIsOn ) {=20
if( t.UserAction !=3D null )
t.UserAction()
if( !t.GetState )
return
if( t.GetState() )
t.SetPressed()
else
t.SetActive()
} =20
}
function _TBUI( clr1,clr2,lOffset,tOffset )
{
SetBorder( GetObj( this.mObjId ),clr1,clr2 )
Offset( GetObj( this.m_elementsId ),lOffset,tOffset )
}
function Offset( obj, top, left ){ obj.style.top=3Dtop; obj.style.left=3Dle=
ft }
function SetBorder( obj, upperLeft, lowerRight )
{
s=3Dobj.style;
s.borderStyle =3D "solid"
s.borderWidth =3D 1=20
s.borderLeftColor =3D s.borderTopColor =3D upperLeft
s.borderBottomColor=3D s.borderRightColor =3D lowerRight
}
function GetBtnObj(){ return gBtnArr[window.event.srcElement.id] }
function BtnOnOver(){ b=3DGetBtnObj(); if( b !=3D null ) b.SetActive() }
function BtnOnDown(){ b=3DGetBtnObj(); if( b !=3D null ) b.SetPressed() }
function BtnOnOut(){ b=3DGetBtnObj(); if( b !=3D null ) b.SetInactive() }
function BtnOnUp()
{
b=3DGetBtnObj()
if( b !=3D null )
b.Perform()
else
Upd()
}
function GetNtsState(){ return parent.gNtsOpen }
function GetOtlState(){ return parent.gOtlOpen }
function GetOtlTxtState(){ return parent.gOtlTxtExp }
function NtsBtnSetFlag( fVal )
{
s=3Ddocument.all.item( this.m_flagId ).style
s.display=3D"none"
if( fVal )
s.display=3D""
else
s.display=3D"none"
}
function _BSetA_Border(){ b =3D gBtnArr[this.mObjId]; if( b !=3D null ) b.S=
etActive() }
function _BSetI_Border(){ b =3D gBtnArr[this.mObjId]; if( b !=3D null ) b.S=
etInactive() }
function _BSetP_Border(){ b =3D gBtnArr[this.mObjId]; if( b !=3D null ) b.S=
etPressed() }
function _BSetA_BorderImg()
{=20
b =3D gBtnArr[this.mBorderId]=20
if( b !=3D null && this.mIsOn && !b.GetState() ) {
obj=3Dthis.ChgState( gHiliteClr,gShadowClr,2 )
obj.style.posTop=3D0
}
}
function _BSetI_BorderImg()
{=20
b =3D gBtnArr[this.mBorderId]
if( b !=3D null && this.mIsOn && !b.GetState() ) {
obj=3Dthis.ChgState( gFaceClr,gFaceClr,1 )
obj.style.posTop=3D0
}
}
var gHiliteClr=3D"THREEDHIGHLIGHT",gShadowClr=3D"THREEDSHADOW",gFaceClr=3D"=
THREEDFACE"
var gBtnArr =3D new Array()
gBtnArr["nb_otl"] =3D new TxtBtn( "nb_otl","nb_otlElem",parent.ToggleOtlPan=
e,GetOtlState )
gBtnArr["nb_otlElem"] =3D new TxtBtn( "nb_otl","nb_otlElem",parent.ToggleOt=
lPane,GetOtlState )
gBtnArr["nb_nts"] =3D new ImgBtn( "nb_nts","nb_ntsBorder",10,parent.ToggleN=
tsPane )
gBtnArr["nb_nts"].SetActive =3D _BSetA_BorderImg;
gBtnArr["nb_nts"].SetInactive =3D _BSetI_BorderImg;
gBtnArr["nb_ntsBorder"] =3D new TxtBtn( "nb_ntsBorder","nb_ntsElem",parent.=
ToggleNtsPane,GetNtsState )
gBtnArr["nb_ntsElem"] =3D new TxtBtn( "nb_ntsBorder","nb_ntsElem",parent.To=
ggleNtsPane,GetNtsState )
gBtnArr["nb_prevBorder"] =3D gBtnArr["nb_prev"]=3D new ImgBtn( "nb_prev","n=
b_prevBorder",30,parent.GoToPrevSld )
gBtnArr["nb_nextBorder"] =3D gBtnArr["nb_next"]=3D new ImgBtn( "nb_next","n=
b_nextBorder",30,parent.GoToNextSld )
gBtnArr["nb_sldshw"]=3D new ImgBtn( "nb_sldshw","nb_sldshwBorder",18,parent=
.FullScreen )
gBtnArr["nb_sldshwBorder"] =3D new TxtBtn( "nb_sldshw","nb_sldshwBorder",pa=
rent.FullScreen,null )
gBtnArr["nb_sldshwBorder"].SetActive =3D _BSetA_Border;
gBtnArr["nb_sldshwBorder"].SetInactive =3D _BSetI_Border;
gBtnArr["nb_sldshwText"] =3D new TxtBtn( "nb_sldshw","nb_sldshwText",parent=
.FullScreen,null )
gBtnArr["nb_sldshwText"].SetActive =3D _BSetA_Border;
gBtnArr["nb_sldshwText"].SetInactive =3D _BSetI_Border;
gBtnArr["nb_voice"] =3D gBtnArr["nb_voiceBorder"] =3D new ImgBtn( "nb_voice=
","nb_voiceBorder",18,parent.ToggleVNarration )
gBtnArr["nb_otlTxtBorder"] =3D gBtnArr["nb_otlTxt"]=3D new ImgBtn( "nb_otlT=
xt","nb_otlTxtBorder",23,parent.ToggleOtlText )
gBtnArr["nb_ntsBorder"].m_flagId=3D "nb_nts"
gBtnArr["nb_ntsBorder"].SetFlag =3D NtsBtnSetFlag
gBtnArr["nb_otlTxt"].ChangeIcon=3D GetOtlTxtState
/*********************************************
Context menu implementation
_CM() is the function that's hooked up to
the oncontextmenu event. Once we're asked to
show the menu, we first build it by creating
DIVs on-the-fly. Then we position it=20
within the screen area so it doesn't get
clipped.
Creating the DIVs using createElement() means
we don't have to write out any extra HTML
into the slide HTML files.
**********************************************/
var sNext=3D"Next",sPrev=3D"Previous",sEnd=3D"End Show",sFont=3D"Arial",sAr=
row=3D"Arrow",sFreeform=3D"Freeform",sRect=3D"Rectangle",sOval=3D"Oval"
function ShowMenu()
{
BuildMenu();
var doc=3DPPTSld.document.body,x=3DPPTSld.event.clientX+doc.scrollLeft,y=
=3DPPTSld.event.clientY+doc.scrollTop
m =3D PPTSld.document.all.item("ctxtmenu")
m.style.pixelLeft=3Dx
if( (x+m.scrollWidth > doc.clientWidth)&&(x-m.scrollWidth > 0) )
m.style.pixelLeft=3Dx-m.scrollWidth
m.style.pixelTop=3Dy
if( (y+m.scrollHeight > doc.clientHeight)&&(y-m.scrollHeight > 0) )
m.style.pixelTop=3Dy-m.scrollHeight
m.style.display=3D""
}
function _CM()
{
if( !parent.IsFullScrMode() ) return;
if(!PPTSld.event.ctrlKey) {
ShowMenu()
return false
} else
HideMenu()
}
function BuildMenu()
{
if( PPTSld.document.all.item("ctxtmenu") ) return
var mObj=3DCreateItem( PPTSld.document.body )
mObj.id=3D"ctxtmenu"
mObj.style.visibility=3D"hidden"
var s=3DmObj.style
s.position=3D"absolute"
s.cursor=3D"default"
s.width=3D"120px"
SetCMBorder(mObj,"menu","black")
var iObj=3DCreateItem( mObj )
SetCMBorder( iObj, "threedhighlight","threedshadow" )
iObj.style.padding=3D2
CreateMenuItem( iObj,sNext,M_GoNextSld,M_True )
CreateMenuItem( iObj,sPrev,M_GoPrevSld,M_HasPrevSld )
=09
CreateSeparator( iObj )
CreateMenuItem( iObj,sEnd,M_End,M_True )
mObj.style.visibility=3D"visible"
}
function Cancel() { window.event.cancelBubble=3Dtrue; window.event.returnVa=
lue=3Dfalse }
function Highlight() { ChangeClr("activecaption","threedhighlight") }
function Deselect() { ChangeClr("threedface","menutext") }
function Perform()
{
e=3DPPTSld.event.srcElement
if( e.type=3D=3D"menuitem" && e.IsActive() )
e.Action()
else
PPTSld.event.cancelBubble=3Dtrue
}
function ChangeClr( bg,clr )
{
e=3DPPTSld.event.srcElement
if( e.type=3D=3D"menuitem" && e.IsActive() ) {
e.style.backgroundColor=3Dbg
e.style.color=3Dclr
}
}
function M_HasPrevSld() { return( parent.HasPrevSld() ) }
function M_GoNextSld() { if( gIsEndShow ) M_End(); else GoToNextSld() }
function M_GoPrevSld() { if( gIsEndShow ) { gIsEndShow=3D0; history.back();=
PPTSld.event.cancelBubble=3Dtrue; } else GoToPrevSld() }
function M_True() { return true }
function M_End() { window.close( self ) }
function CreateMenuItem( node,text,action,eval )
{
var e=3DCreateItem( node )
e.type=3D"menuitem"
e.Action=3Daction
e.IsActive=3Deval
e.innerHTML=3Dtext
if( !e.IsActive() )
e.style.color=3D"threedshadow"
e.onclick=3DPerform
e.onmouseover=3DHighlight
e.onmouseout=3DDeselect
s=3De.style;
s.fontFamily=3DsFont
s.fontSize=3D"9pt"
s.paddingLeft=3D2
}
function CreateSeparator( node )
{
var sObj=3DCreateItem( node )
SetCMBorder(sObj,"menu","menu")
var s=3DsObj.style
s.borderTopColor=3D"threedshadow"
s.borderBottomColor=3D"threedhighlight"
s.height=3D1
s.fontSize=3D"0px"
}
function CreateItem( node )
{
var elem=3DPPTSld.document.createElement("DIV")
node.insertBefore( elem )
return elem
}
function SetCMBorder( o,ltClr,rbClr )
{
var s=3Do.style
s.backgroundColor=3D"menu"
s.borderStyle=3D"solid"
s.borderWidth=3D1
s.borderColor=3DltClr+" "+rbClr+" "+rbClr+" "+ltClr
}
------=_NextPart_01C7A94C.ACFDEEC0
Content-Location: file:///C:/ECBAB22B/ACMS2007-Shrink_files/fullscreen.htm
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="us-ascii"
Uses and Limitations of Dynamic Geometry and Computer Algebra in the
Analysis of the Shrinking Circle Problem
------=_NextPart_01C7A94C.ACFDEEC0--
–Extremely sensitive to
floating-point cancellation
–
•Symbolic
![](3D"slide0005_image005.jpg")
<=
![endif]>
![](3D"slide0005_image007.jpg")
<=
![endif]>
![](3D"slide0005_image009.jpg")
<=
![endif]>
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–Indeterminate form
(l’Hopital, or simply rationalize)
(l’Hopital, or simply rationalize)
–
•Geometric
<=
/div>
–Tom Banchoff (Brown
University)
–
–
<=
![endif]><=
![endif]><=
![endif]>
OP =3D OQ
is isosceles
SR=3DSQ < OS
OR =3D OS + SR < 2 OS
P à O
Q à O
QS à OS
<=
/div>
![](3D"slide0006_image012.gif")
![](3D"slide0006_image014.gif")
![](3D"slide0006_image016.gif")
![](3D"slide0006_image018.gif")
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OR =3D OS+SR =3D OS+QS 2OS
Geometric Proof
•
•=
Details and Generalizations
•D.B. Meade and W-C Yang,
Analytic, Geometric, and Numeric Analysis of the Shrinking Circle and Sphere Problems, Electron= ic Journal of Mathematics and Technology, vol. 1, issue 1, Feb. 2007, ISSN 1993-2823http://www.radford.edu/~scorwin/eJMT/Content/ <=
span
style=3D'position:absolute;top:82.0%;left:9.73%;width:84.45%;height:6.0%'>=
Papers/v1=
n1p4/
Analytic, Geometric, and Numeric Analysis of the Shrinking Circle and Sphere Problems, Electron= ic Journal of Mathematics and Technology, vol. 1, issue 1, Feb. 2007, ISSN 1993-2823
<=
span
style=3D'font-size:88%'>•=
http://www.math.sc.edu/~meade/eJMT-Shrink/
•Generalized
Shrinking Circle Problem<=
/span>
•
Let C be a fixed curve and let Cr be the circle with cen=
ter
at the origin and radius r. P is the point (=
0,
r), Q is the upper point of intersection of C a=
nd Cr ,
and R is the point of intersection of the line PQ
and the x-axis.
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What happ=
ens to
R as Cr shrinks?
<=
span
style=3D'visibility:hidden'>•
Lemma
Then
=
R à (4a, 0) if <=
i>b
=3D 0
R à ( 0, 0 )
otherwise
<=
span
style=3D'visibility:hidden'>•
Theorem
• Let C be a curve in the plane=
that
includes the origin =
and is
twice continuously differentiable at the
origin. Define Cr , P, Q, and R as in the Generalized
Shrinking Circle Problem. If the curvature
at the origin, k, is positive, the osculating circle of C at the origin has radius r=3D1/k and center (a, b)=
where a2 +=
b2 =3D =
r2.
•
•Then,
• R &agr=
ave; (4r, 0 ) if b=3D0
• R &agr=
ave; ( 0, 0 ) otherwise
•
Theorem (Coordinate-Free)
• Let O be a point on a curve <=
/span>C in t=
he plane
where the osculating circle =
to C at <=
/span>O exis=
ts. Let T and N=
be the unit tangent and normal vectors to C at O<=
/span>, respectively. Let k be the curvat=
ure of
C
at O.
•
(N is oriented so that O + 1/k N is the center of the osculating circle to = C at <= /span>O.)= 3;
(N is oriented so that O + 1/k N is the center of the osculating circle to = C at <= /span>O.)= 3;
•
• For any r > 0,
define
•<=
/span>Cr to be the circle with radius r cent=
ered at O,
=
;
•<=
/span>P =3D O + r T, the=
point
at the “top” of C<=
/span>r ,
•<=
/span>Q to b=
e the
intersection of C and C=
r , and
•<=
/span>R to b=
e the
point on the line through P and Q=
such that OR is parallel
with N
•
•Then, as =
r decr=
eases to
0,
R
converges to the point R0 =
=3D O + 4 N.
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