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相同圖形的拼砌（有兩組平行線的四邊形）
Author:
ho ting chit
GeoGebra
New Resources
兩位數除以一位數（二）
画直线等分三角形的面积
兩組對邊相等的四邊形
畫出對稱圖形
四邉形 (四年級) 教師版
Discover Resources
it's for fun
橢圓之極偶 / polarity for ellipse
方形地毯
基础知识
展開圓面積 (講義版)的副本
Discover Topics
Linear Programming or Linear Optimization
Equilateral Triangles
Numbers
Integral Calculus
Geometric Transformations