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三角形外心的位置
Author:
均一
GeoGebra
New Resources
画直线等分三角形的面积
三位數除以一位數（一）
兩組對邊相等的四邊形
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
Discover Resources
雨刷中的數學
quadrilaterals 6
兩點距離
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
齊找對稱軸
Discover Topics
Hypergeometric Distribution
Matrices
Arithmetic Operations
Trigonometry
Isosceles Triangles