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定值角度
Author:
郭勇
GeoGebra
New Resources
三位數除以一位數（二）
画直线等分三角形的面积
異分母分數減法
兩組對邊相等的四邊形
找出對稱軸
Discover Resources
動態比大小
封閉圖形填顏色
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
銳角三角：tan
平行四边形
Discover Topics
Orthocenter
Matrices
Linear Equations
Similar Triangles
Histogram