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三角形外心的角度關係

Author:均一

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四邊形的特性
sanjiaohanshu
找出對稱軸
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形

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距離和
代數運算：外心座標
弦中點
hw02
光的反射

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Surface
Division
Parallelogram
Circumcircle or Circumscribed Circle
Equilateral Triangles

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