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猜猜平均數（限時版）
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
拼砌四邊形
球體建築師
找出對稱軸
兩組對邊相等和有直角的四邊形
畫出對稱圖形
Discover Resources
Rotational Symmetry
畢氏定理
Angles between 2 planes
兩數相加
sanjiaohanshu
Discover Topics
Isosceles Triangles
Standard Deviation
Functions
Sphere
Linear Programming or Linear Optimization