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三角形的外心
Author:
侯杰材
GeoGebra
New Resources
找出對稱軸
三位數除以一位數（一）
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
Discover Resources
塗色
Positive angles & Negative angles
判別式
常見平行線例題圖形繪製
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
Discover Topics
Equilateral Triangles
Trapezoid
Rectangle
Tangent Function
Combinatorics