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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
畫出對稱圖形
錐體建築師
拼砌四邊形
画直线等分三角形的面积
兩位數除以一位數（一）
Discover Resources
環形面積
教學－橫切面
地球20160328
黎曼和
人生宇宙
Discover Topics
Tree Diagrams
Constructions
Statistics
Similarity Transformation or Similarity
Logarithmic Functions