椭圆是平面解析几何中的一种重要曲线,是常见的几何图形,是每年高考中圆锥曲线部分的一个重要命题点,它有两种定义.第一定义:平面内到两定点的距离之和是常数(大于两定点的距离)的动点的轨迹是椭圆.第二定义:平面内到一定点的距离与到一 Ellipse is an important curve in plane analytic geometry. It is a common geometric figure. It is an important proposition point in the annual conic section of the college entrance examination. It has two definitions. The first definition is the sum of the distances from the plane to the two fixed points. The trajectory of a moving point that is a constant (greater than two fixed points) is an ellipse. Second definition: the distance from the point to a point in the plane and to