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semicircle

Author:Tzeng, Shyuh-yaur

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四邊形的特性
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
直角坐標平面上的旋轉變換
四邉形 (四年級) 教師版

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輪盤輪盤
An angle problem
test01
最小周長
函數

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Special Points
Geometry
Equilateral Triangles
Tangent Line or Tangent
Kite

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