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長方形
Author:
Yip Chi Wai
GeoGebra
New Resources
兩位數加法
三位數除以一位數（一）
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
找出對稱軸
Discover Resources
圓繞圓
學生自行製作棒形圖
How to draw an ennegon with ruler and compasses?
Arbelos
中國火柴遊戲一
Discover Topics
Symmetry
LCM and GCD
Terms
Division
Intersection