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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
New Resources
拼砌四邊形
画直线等分三角形的面积
找出對稱軸
GeoGebra笔记功能体验课件
柱體建築師
Discover Resources
cos, sin 與單位圓
Concept of Ratios 比的概念
Parameter
正立方體與平面的截面
三角形的概念
Discover Topics
Stochastic Process or Random Process
Upper and Lower Sum or Riemann Sum
Prism
Scalene Triangles
Difference and Slope