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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
New Resources
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（一）
柱體建築師
三位數除以一位數（二）
Discover Resources
Meaning of Negative Indices 負指數的意義
藝術著色2
斜拋模型
矮額 太空喔
平行線(方格版)
Discover Topics
Trigonometric Functions
Cube
Centroid or Barycenter
Rotation
Vectors 2D (Two-Dimensional)