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圓周 (圖形A)
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
球體建築師
三位數除以一位數（二）
三位數除以一位數（一）
算柱 (兩位數)
畫出對稱圖形
Discover Resources
Task 7: Visualize the Theorem of Thales
旋梯
p11-10
DSE Circle-ACT02A Relationship Between Angles and Centre and Circumference
正五角錐(旋轉，實體、透視)
Discover Topics
Equilateral Triangles
Parametric Curves
Means
Combinatorics
Differential Equation