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正二十面體
Author:
侯杰材
正二十面體
GeoGebra
New Resources
兩組對邊相等的四邊形
判斷球體
畫出對稱圖形
兩組對邊相等和有直角的四邊形
第八周作业
Discover Resources
鏡射
用極座標做時鐘
折正三角形
母子性質-1（動畫）
椭圆的定义
Discover Topics
Similar Triangles
Bar Chart or Bar Graph
Definite Integral
Unit Circle
Quadrilaterals