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文[1]证明了非等边△ABc的欧拉线(过重心、外心的直线)平行于边BC时,顶点A的轨迹为一个椭圆. 非等边三角形的重心、内心、界心(又称
The paper [1] proved that when the Euler line of the non-equilateral △ABc (the line of excess center of gravity, external line) is parallel to the edge BC, the trajectory of the vertex A is an ellipse. The center of gravity of the non-equilateral triangle, the inner heart, the center of the circle ( Said