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合 24（淺中深）
Author:
Anthony OR 柯志明
GeoGebra
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球體建築師
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩組對邊相等的四邊形
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工具：PlaneArrows, PlaneText... (v.2)
圆的面积展开的副本
max2
绘本1-平面直角坐标系复习
Discover Topics
Line Segment
Median Line
Coordinates
Set Theory
Secant Line or Secant