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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
算柱 (兩位數)
兩位數加法
異分母分數減法
柱體建築師
兩位數除以一位數（二）
Discover Resources
圓柱的截面
小數加減
圓系
定积分求几何体体积 Definite Integral
拋物線2-焦點法
Discover Topics
Rotation
Similar Triangles
Tangent Function
Fractal Geometry
Right Triangles