Difference between revisions of "A 5-circle incidence theorem"

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Line 1: Line 1:
 
<jsxgraph width="600" height="600">
 
<jsxgraph width="600" height="600">
 
var board = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
 
var board = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
var A = [], s = [], B = [], c = [], k;
+
var A = [], s = [], B = [], c = [], r = [], k;
  
var attA = {name:'',strokeColor:'#7355ff',fillColor:'#7355ff'};
+
var attA = {name:'',strokeColor: '#7355ff', fillColor: '#7355ff'};
 
attA.name = "0";
 
attA.name = "0";
 
A[0] = board.create('point', [2.5, -3], attA);
 
A[0] = board.create('point', [2.5, -3], attA);
Line 22: Line 22:
  
  
var attB = {name:'',strokeColor:'#EA0000',fillColor:'#EA0000'};
+
var attB = {name: '', strokeColor: '#EA0000', fillColor: '#EA0000'};
 
for (k = 0; k < 5; k++) {
 
for (k = 0; k < 5; k++) {
 
   B[k] = board.create('intersection', [s[k], s[(k-1+5)%5], 0], attB);
 
   B[k] = board.create('intersection', [s[k], s[(k-1+5)%5], 0], attB);
Line 30: Line 30:
 
for (k = 0; k < 5; k++) {
 
for (k = 0; k < 5; k++) {
 
   c[k] = board.create('circle', [A[k], B[k], A[(k+1)%5]], attC);
 
   c[k] = board.create('circle', [A[k], B[k], A[(k+1)%5]], attC);
 +
}
 +
 +
var attR = {strokeColor: '#aaaaaa', strokeWidth: 1};
 +
for (k = 0; k < 5; k++) {
 +
  r[k] = board.create('radicalaxis', [c[k], c[(k-1+5)%5]], attR);
 
}
 
}
  

Revision as of 13:18, 13 August 2019