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利用单位圆生成y=sin（x）在[0,2pi]的图象
Author:
孙琰
GeoGebra
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拼砌四邊形
兩組對邊相等和有直角的四邊形
球体的体积推导
四邉形 (四年級) 教師版
找出對稱軸
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阿波羅尼亞圓
ABC 2
兩圓外公切線
圖一
Copy of 劉徽的「割圓術」
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Rational Numbers
Optimization Problems
Rhombus
Hyperbola
Rotation