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Exterior Angle Cyclic Quadrilateral

Author:Max Wong

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畫出對稱圖形
三位數除以一位數（二）
兩組對邊相等的四邊形
三位數除以一位數（一）
找出對稱軸

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幾何作業
點和圓的位置關係
example 3
Angles formed by two straight lines and transversal
-(√3/2)³ ≤ sinα sinβ sinγ ≤ (√3/2)³

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Equilateral Triangles
Division
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