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長方形
Author:
Yip Chi Wai
GeoGebra
New Resources
兩位數除以一位數（二）
直線的斜率
祖冲之的期望：内棋与外棋
平行線的斜率
球体的体积推导（优化版）
Discover Resources
np2c
外心
畢氏定理
Copy of 固定面積的圖形的周界變化
十六菊
Discover Topics
Perimeter
Cuboid
Trigonometry
Geometric Mean
Rational Numbers