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圓周 (圖形B)
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
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數除以一位數（一）
錐體建築師
Discover Resources
橢圓規
旋轉體 (Disk Method)
正方形內部
內外切圓性質
Hamid Naderi Yeganeh segment4
Discover Topics
Unit Circle
Vectors 3D (Three-Dimensional)
Square
Prism
Confidence Interval