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百葉窗2
Author:
李春培
GeoGebra
New Resources
斜率的值
祖冲之的期望：内棋与外棋
讀磅
多邊形的面積
三位數除以一位數（二）
Discover Resources
河內塔 (Tower of Hanoi)
Proof of Pythagoras Theorem
阿波羅圓
先估算，後看解釋
中垂線
Discover Topics
Tangent Function
Straight Lines
Linear Programming or Linear Optimization
Circle
Similar Triangles