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Quiz on Centres of Triangles 三角形的中心：測驗
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.gmath.hk
New Resources
判斷球體
拼砌四邊形
錐體建築師
四邉形 (四年級) 教師版
柱體建築師
Discover Resources
線性組合3：正方形
Sine Wave 3D
随机数表
碎形
橢圓的副本
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Geometric Transformations
Probability
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Area
Derivative