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圓外切及內切
Author:
luke huang
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
錐體建築師
兩組對邊相等的四邊形
Discover Resources
光源距離 Light Source Distance
數位學習社
Locus (Two points 1)
Control a, b and c in quadratic function
Angle at centre twice angle at circumference
Discover Topics
Arithmetic Operations
Median Line
Cylinder
Expected Value
Vectors