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将三角形面积一分为二
Author:
谢鹏
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
球体的体积推导（优化版）
拼砌四邊形
兩位數加法
Discover Resources
Triangle
三角形內角和
Angle in alternate segment
斜坐標
空间立方体
Discover Topics
Dilation
Sine
Linear Equations
Limits
Set Theory