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Author:
袁智强
GeoGebra
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双心四边形
平行線的判定
折扣
龙形曲线-分形龙
三角函数 的副本
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圓內接四邊形 ABCD ...，求 sinθ=?
鉛筆的長度
正方形和等邊三角形轉化_李樂雯
外心的找法與特性
平面直角坐标系
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Quadratic Functions
Triangles
Definite Integral
Trigonometry
Circumcircle or Circumscribed Circle