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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
New Resources
三位數除以一位數（二）
異分母分數減法
GeoGebra笔记功能体验课件
找出對稱軸
兩組對邊相等的四邊形
Discover Resources
圓形與相似形
用面積逼近圓周率
Why same areas?
面積1轉正三角形
劉徽的「割圓術」的副本
Discover Topics
Complex Numbers
Straight Lines
Rhombus
Natural Numbers
Real Numbers