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圓周 (圖形I)
Author:
Keith Ko
移動右圖中的紅線到左方虛線，就知道它是相等於左圖的哪條線。
GeoGebra
New Resources
找出對稱軸
球体的体积推导（优化版）
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
畫出對稱圖形
Discover Resources
範例
七巧板揖人2
Sequence指令練習(包絡線：拋物線)
補角關係
Section Curves (2)
Discover Topics
Scatter Plot
Vectors
Expected Value
Rectangle
Poisson Distribution