Difference between revisions of "Five Circle Theorem"

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Line 1: Line 1:
 
<jsxgraph width="600" height="600">
 
<jsxgraph width="600" height="600">
 
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
 
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
var p = [];
+
var p = [], l = [], i = [], c = [], j = [], k;
var l = [];
 
var i = [];
 
var c = [];
 
var j = [];
 
  
 
p[0] = brd.create('point',[-2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
 
p[0] = brd.create('point',[-2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
Line 33: Line 29:
 
cc[1].setProperty({strokeColor:'red',strokeWidth:2});
 
cc[1].setProperty({strokeColor:'red',strokeWidth:2});
 
cc[0].setProperty({strokeColor:'#000000',fillColor:'#000000',style:3});
 
cc[0].setProperty({strokeColor:'#000000',fillColor:'#000000',style:3});
 
 
</jsxgraph>
 
</jsxgraph>
  
Line 40: Line 35:
 
<source lang="javascript">
 
<source lang="javascript">
 
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
 
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
var p = [];
+
var p = [], l = [], i = [], c = [], j = [], k;
var l = [];
 
var i = [];
 
var c = [];
 
var j = [];
 
  
 
p[0] = brd.create('point',[-2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
 
p[0] = brd.create('point',[-2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});

Revision as of 15:23, 4 August 2010

The underlying JavaScript code

var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
var p = [], l = [], i = [], c = [], j = [], k;

p[0] = brd.create('point',[-2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
p[1] = brd.create('point',[-0,4],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
p[2] = brd.create('point',[2.5,-3],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
p[3] = brd.create('point',[-4,0],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});
p[4] = brd.create('point',[4,0],{name:'',strokeColor:'#7355ff',fillColor:'#7355ff'});

for (k=0;k<5;k++) {
   l[k] = brd.create('segment',[p[k],p[(k+1)%5]],{strokeColor:'black',strokeWidth:1});
}

for (k=0;k<5;k++) {
   i[k] = brd.create('point',[brd.intersection(l[k],l[(k+2)%5],0)],{name:'',strokeColor:'#EAEA00',fillColor:'#EAEA00'});
}

for (k=0;k<5;k++) {
   c[k] = brd.create('circumcircle',[p[k],i[k],i[(k+2)%5]],{});
   c[k][1].setProperty({strokeColor:'gray',strokeWidth:1});
   c[k][0].setProperty({visible:false});
}
for (k=0;k<5;k++) {
   j[k] = brd.create('point',[brd.intersection(c[k][1],c[(k+2)%5][1],0)],{name:'',strokeColor:'#EA0000',fillColor:'#EA0000'});
}

cc = brd.create('circumcircle',[j[0],j[2],j[3]],{});
cc[1].setProperty({strokeColor:'red',strokeWidth:2});
cc[0].setProperty({strokeColor:'#000000',fillColor:'#000000',style:3});