From Wikipedia, the free encyclopedia
拉数学里向，椭圆是平面上到两个固定点个距离之和为常数个点个轨迹。
椭圆是一种圆锥曲线：如果一个平面切截一个圆锥面，且弗托渠个底面相交，也弗托渠个底面平行，各圆锥搭平面交截线是个椭圆。
椭圆是圓錐斜切開個橫切面曲線，像隻壓扁脫個圓。
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