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三角形外角和=360⁰
Author:
李春培
三角形外角和=360⁰
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
三位數除以一位數（二）
畫出對稱圖形
球体的体积推导（优化版）
Discover Resources
馬奔跑
Orthographic views example
(006)80102
单晨正方形在正六边形内部滚动的课件
无理数指数幂
Discover Topics
Exponential Functions
Square
Boxplot
Continuity
Equilateral Triangles