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外心垂心問題
Author:
連琨銘
GeoGebra
New Resources
画直线等分三角形的面积
異分母分數減法
兩位數除以一位數（一）
判斷球體
【案例】2018年全国1卷理科12题
Discover Resources
四邊形 (2001 舊課程教師版)
Angle between a Line and a Plane
九點圓
invariance interval
整數點
Discover Topics
Symmetry
Derivative
Rectangle
Unit Circle
Matrices