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30度直角三角形
Author:
郭勇
GeoGebra
New Resources
四邊形的特性
兩組對邊相等和有直角的四邊形
畫出對稱圖形
異分母分數減法
兩位數加法
Discover Resources
自行车运动
testing2
圓錐截痕
Equality of Ratios
周界
Discover Topics
Constructions
Arithmetic Operations
Sphere
Reflection
Scalene Triangles