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凹正方形
Author:
王玉霞
GeoGebra
New Resources
錐體建築師
兩位數加法
拼砌四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
Discover Resources
parallelogram and squares
Quiz on Solving Right Triangles (Finding Angles) 解直角三角形：測驗2（求角度）
All in one (Centres of triangle)
弓形的滚动
达芬奇椭圆仪
Discover Topics
Inequalities
Random Experiments
Translation
Cosine
Conditional Probability