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 | + | var board = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]}); |
| − | var A = [], s = [], B = [], k; | + | var A = [], s = [], B = [], c = [], k; |
var attA = {name:'',strokeColor:'#7355ff',fillColor:'#7355ff'}; | var attA = {name:'',strokeColor:'#7355ff',fillColor:'#7355ff'}; | ||
attA.name = "0"; | attA.name = "0"; | ||
| − | A[0] = | + | A[0] = board.create('point', [2.5, -3], attA); |
attA.name = "1"; | attA.name = "1"; | ||
| − | A[1] = | + | A[1] = board.create('point', [2, 4], attA); |
attA.name = "2"; | attA.name = "2"; | ||
| − | A[2] = | + | A[2] = board.create('point', [-2.5, 3], attA); |
attA.name = "3"; | attA.name = "3"; | ||
| − | A[3] = | + | A[3] = board.create('point', [-4, -2], attA); |
attA.name = "4"; | attA.name = "4"; | ||
| − | A[4] = | + | A[4] = board.create('point', [0, -4], attA); |
for (k = 0; k < 5; k++) { | for (k = 0; k < 5; k++) { | ||
| − | s[k] = | + | s[k] = board.create('segment',[A[k], A[(k + 2) % 5]],{strokeColor:'blue',strokeWidth:1}); |
} | } | ||
| Line 24: | Line 24: | ||
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] = | + | B[k] = board.create('intersection', [s[k], s[(k-1+5)%5], 0], attB); |
} | } | ||
| + | |||
| + | for (k = 0; k < 5; k++) { | ||
| + | c[k] = board.create('circle', [A[k], B[k], A[(k+1)%5], 0]); | ||
| + | } | ||
| + | |||
</jsxgraph> | </jsxgraph> | ||
