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平行四邊形
Author:
eyun306
Topic:
Parallelogram
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
画直线等分三角形的面积
三位數除以一位數（一）
找出對稱軸
Discover Resources
三角形的心
複數等比級數
黎曼和
angles sum on a striaght line
Testing
Discover Topics
Poisson Distribution
Natural Numbers
Fractions
Cube
Frequency Distribution