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Tangent of a Circle 圓的切線
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
三位數除以一位數（一）
判斷球體
畫出對稱圖形
画直线等分三角形的面积
四邉形 (四年級) 教師版
Discover Resources
Area of cirle
內切圓
禪繞畫
四邊形的特性
手拉手模型
Discover Topics
Addition
Quadrilaterals
Histogram
Pyramid
Triangles