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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
拼砌四邊形
異分母分數減法
球體建築師
兩組對邊相等的四邊形
兩位數除以一位數（二）
Discover Resources
lab5_task2
conjugate
數位學習社12/15
閱讀鐘面及數字鐘（時和分）的副本
一次函数图像
Discover Topics
Circumcircle or Circumscribed Circle
Calculus
Numbers
Sine
Median Line