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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
畫出對稱圖形
判斷球體
找出對稱軸
四邊形的特性
長方體平面投影 (Codex版)
Discover Resources
平行線的性質
Math
Ladder on Wall
zentangle
地球各緯度的晝長夜長
Discover Topics
Addition
Surface
Matrices
Bar Chart or Bar Graph
Limits