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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
球体的体积推导
四邉形 (四年級) 教師版
錐體建築師
兩位數除以一位數（一）
柱體建築師
Discover Resources
七巧板
Choose the most suitable 'improvised units'(中間人)
Chords of a Circle
正立方體切三刀
三视图积木
Discover Topics
Circumcircle or Circumscribed Circle
Rational Numbers
Linear Regression
Median Value
Area