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Author:
Lee Chun Ming
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兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
近似值：有效數字
兩組對邊相等的四邊形
找出對稱軸
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Slope of perpendicular lines
扇形柱(調整底面圓的分割數，柱高)
Trigonometric Relations(90,270)
圆的面积展开的副本
S3 Ex4.3 Q06(3D圖)
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Rectangle
Set Theory
Cuboid
Diagrams
Translation