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最小周長
Author:
張庭瑞
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩位數除以一位數（一）
錐體建築師
找出對稱軸
Discover Resources
尺規作圖乾淨版
平行四邊形柱算體積(可以切開)
Test
鱼儿找食物
自製工具：CurveFit, Bezier
Discover Topics
Triangles
Normal Distribution
Cone
Perimeter
Secant Line or Secant