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Parallelogram
Author:
Chu Siu Hin
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
找出對稱軸
拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
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正四面體利用向量座標轉換展開圖
鏡射矩陣
Similar triangles inscribed iteration400
P6 圓周01D
Gaussian Heptagon construction
Discover Topics
Statistical Characteristics
Congruence
Trapezoid
Kite
Sphere