Ellipses

An ellipse is formed by cutting a three dimensional cone with a slanted plane. This differs from a circle in that an ellipse does not have a constant radius. It has a radius that changes in between an x radius and y radius. However, an ellipse has two focal points in which the sum of the length of both focal points to any given point on the ellipse is always the same.http://www.wyzant.com/help/math/algebra/conic_sections

Ellipses

Real World Example

A real world example of an elipse is the wall of death. The wall of death is a type of mosh pit in which the participates form a large elliptical shape. You can find this at your local heavy metal concert.

Center: (0,0)Radi: (-2.8,0) ( 2.8,0)