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congruent (SAS)
Author:
Ricky Chan
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩位數除以一位數（二）
算柱 (兩位數)
找出對稱軸
柱體建築師
Discover Resources
滾出曲線滾出曲線
Escher 階梯 (Penrose Stair)
先估算，後看解釋
掷骰子
八個方向
Discover Topics
Confidence Interval
Similar Triangles
LCM and GCD
Geometric Distribution
Limits