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Author:
Dennis_Zhao
GeoGebra
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第八周作业
直角坐標平面上的旋轉變換
四邊形的特性
畫出對稱圖形
三位數除以一位數（一）
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三角形的內角和＝180度
Geometry: Types of Angles 2 (幾何：角的種類 2)
國徽
duality of regular polyhedron
力的合成
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Numbers
Random Experiments
Conic Sections
Parallelogram
Arithmetic Operations