In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.
An ellipse is also the locus of all points of the plane whose distances to two fixed points add to the same constant.
An ellipse is also the locus of all points of the plane whose distances to two fixed points add to the same constant.
Write a simpler version for the sentence: In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. Output: