An ellipse is the set of all points in a plane such that the sum of the distances from two fixed points to every point in line is constant.
The formula generally associated with the focus of an ellipse is c2= a2 − b2
c is the distance from the focus to vertex and
b is the distance from the vertex a co-vetex on the minor axis
Area of Ellipse : [ π×r1×r2 ]
The Volume of Ellipse : [ (4/3)×π×r1×r2×r3 ]
Perimeter of Ellipse : [ 2×π×Sqrt((r1² + r2²)/2) ]