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angle between lines
Author:
johnmayhk
GeoGebra
New Resources
【案例】2018年全国1卷理科12题
找出對稱軸
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
柱體建築師
Discover Resources
圓的面積
正方形和長方形有甚麼特性？
同心圓和線段-3(線段到最外圓有小圓)
勝者即正義
拋物線1-焦點法
Discover Topics
Centroid or Barycenter
LCM and GCD
Pyramid
Vectors 3D (Three-Dimensional)
Special Points