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固定邊長之長方形的特定內接平行四邊形面積
Author:
Aoi Yamada
AP=BQ=CR=DS=X X和PQRS面積之關係
GeoGebra
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球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
畫出對稱圖形
【案例】2013年安徽高考15题
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directed number_the age of father and son
Copy of 固定周界的長方形的面積變化
拋物線五-包絡線法
高考真题椭圆
圓錐截痕
Discover Topics
General Quadrilateral
Pythagoras or Pythagorean Theorem
Matrices
Intersection
Diagrams