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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
球體建築師
拼砌四邊形
美國國旗 (Claude 版)
四邉形 (四年級) 教師版
Discover Resources
S5 2D Trigonometry
P3 平行與垂直
Multiplication of Polynomials(多項式的乘法)
勾股定理
初三第十五讲真卷4-23题
Discover Topics
Area
Scalene Triangles
Secant Line or Secant
Confidence Interval
Limits