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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
柱體建築師
兩位數除以一位數（二）
兩位數加法
Discover Resources
Finding the H.C.F. and the L.C.M.
可互相控制的動點與滑桿
說明用01
limits
竞猜游戏：说出图中角的大小
Discover Topics
Line Segment
Rectangle
Cosine
Combinatorics
Optimization Problems