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相机光圈模拟（3D）
Author:
孟宝兴
GeoGebra
New Resources
算柱 (兩位數)
找出對稱軸
直角坐標平面上的旋轉變換
兩位數加法
兩位數除以一位數（一）
Discover Resources
截面法體積(1)
滑桿動畫(起始檔案)
面积平分线
圆面积公式推导
音乐播放器(需下载到本地使用)
Discover Topics
Straight Lines
Triangles
Subtraction
Upper and Lower Sum or Riemann Sum
Differential Calculus