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Triangular Number 三角形數
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
圓的切線方程
垂直線的斜率
斜率的值
画直线等分三角形的面积
平行線的斜率
Discover Resources
大樂透開獎機有特別號
龍騰4_1-1習10
繪畫三角形的外接圓
全等三角形
對稱(LEVEL 1)
Discover Topics
Histogram
Median Line
Trapezoid
Subtraction
Standard Deviation