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多边形内角
Author:
sschy
GeoGebra
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比較五件物件的重量
龙形曲线-分形龙2
圓的基本性質
撒针估算面积实验
直線的斜率：水平變化 & 鉛垂變化
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用正多邊形面積逼進圓周率
Apollonius Problem gergonne
例子
江苏省职校数学网络资源
Template: 對稱02
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Diagrams
Equations
Equilateral Triangles
Statistics
Parametric Curves