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正方形纸片剪出正三角形（顶点在边上）
Author:
taoyfa
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
球體建築師
兩位數除以一位數（一）
兩位數除以一位數（二）
找出對稱軸
Discover Resources
proof SAS
拋物線軌跡圖
随机分支长度的二分树
定義篇
碎形三角形
Discover Topics
Mathematics
Equilateral Triangles
Statistical Characteristics
Constructions
Surface