Lesson 71

An ellipse is defined as the set of all points such that the sum of the distances from the point to two fixed foci points is a constant. The major axis is the longest side of the ellipse, and the two fixed points are called the foci. The standard form of the ellipse equation is (x/a)^2 + (y/b)^2 = 1, where a is half the length of the major axis and b is half the length of the minor axis.