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形心计算
Author:
阳光
Topic:
Centroid or Barycenter
GeoGebra
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兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（二）
畫出對稱圖形
第八周作业
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方格紙上畫正方形4
Is this a prism 13
證明三角形內角和180度
test
Geometry: Plane Figures (幾何： 平面圖像)
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Equations
Congruence
Orthocenter
Terms
Plane Figures or Shapes