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長方形
Author:
Yin Kelvin Wong
GeoGebra
New Resources
畫出對稱圖形
球体的体积推导
錐體建築師
球体的体积推导（优化版）
画直线等分三角形的面积
Discover Resources
廣義角
練習 - 逆時針旋轉（三角形）
Sequence指令練習(逐一套疊三角形)
三角形內角和_2
一次函数的引入
Discover Topics
Trigonometric Functions
Linear Equations
Rhombus
Mathematics
LCM and GCD