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Perimeter

Author:Ting Chui Yee, Anthony OR 柯志明, Angela Yan

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異分母分數減法
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）

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games
World's Second-Hardest Easy Geometry Problem
gltcf 長方體
Sine Wave 3D
畢氏定理

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Cuboid
Quadrilaterals
Logarithmic Functions
Integers
Plane Figures or Shapes

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