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兩針夾角
Author:
李春培
GeoGebra
New Resources
拼砌四邊形
兩位數加法
錐體建築師
兩組對邊相等的四邊形
三位數除以一位數（二）
Discover Resources
面積：從梯形到三角形 02
漂亮ㄉ東東
正方体展开图的副本
堆叠方块
C60足球模型展开（双色版）
Discover Topics
Similar Triangles
Distributions
Tangent Function
Perimeter
Plane Figures or Shapes