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凹多边形的凹凸角之间的大小关系
Author:
郭勇
GeoGebra
New Resources
三位數除以一位數（二）
找出對稱軸
直角坐標平面上的旋轉變換
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
廣義量角器
平方差
test
周界2
滚动的石头
Discover Topics
Optimization Problems
Geometric Transformations
LCM and GCD
Special Points
Straight Lines