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等周长的正方形和圆的面积比较
Author:
海平 文
Topic:
Circle
GeoGebra
New Resources
球体的体积推导
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
三位數除以一位數（一）
Discover Resources
河內塔 (Tower of Hanoi)
GGB-BOOK
伸展收縮變換
纏繞畫1
圆在直线上滚动
Discover Topics
Real Numbers
Equilateral Triangles
Geometric Mean
Arithmetic
Line Segment