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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
近似值：有效數字
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
異分母分數減法
畫出對稱圖形
Discover Resources
代數運算
glt-h02-00-正方形折成三角錐
對數函數圖
紙飛機
sin函數相加
Discover Topics
Difference and Slope
Parallelogram
Fractions
Integers
Symmetry