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圓周 (圖形H)
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
兩位數加法
三位數除以一位數（一）
找出對稱軸
算柱 (兩位數)
拼砌四邊形
Discover Resources
余弦定理的证明
數線_小數的認識
平面截距式的副本
加减乘除法综合
伞骨架模型
Discover Topics
Trigonometric Functions
Volume
Sequences and Series
Probability
Derivative