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共垂心
Author:
Altmann Cho
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
畫出對稱圖形
拼砌四邊形
兩位數除以一位數（二）
直角坐標平面上的旋轉變換
Discover Resources
動態比大小
三角形内角和，演示
複合圖形表面積(一)
Graph of Exponential function
拼出三角形的副本
Discover Topics
Square
Hypergeometric Distribution
Parametric Curves
Polygons
Fractal Geometry