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Copy of Triangular Number
Author:
Ronan Downes
,
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
GeoGebra笔记功能体验课件
三位數除以一位數（一）
拼砌四邊形
異分母分數減法
四邉形 (四年級) 教師版
Discover Resources
題四
Cross Product for 2D Vectors (平面外積)
圓與切線
直线与圆相切
刘校安排（1）
Discover Topics
Quadrilaterals
Geometric Transformations
Mode
Variance
Triangles