Can any body say the definition of ellipse?
An ellipse is a locus of points in a plane such that the sum of the distances to two fixed points is a constant. The two fixed points are called foci. An alternate definition would be that an ellipse is the path traced out by a point whose distance from a fixed point, called the focus, maintains a constant ratio less than one with its distance from a straight line not passing through the focus, called the directrix. An ellipse is a type of conic section: if a conical surface is cut by a plane which does not intersect the cone’s base, the intersection of the cone and plane is an ellipse.
A closed, symmetric curve shaped like an oval, which can be formed by intersecting a cone with a plane that is not parallel or perpendicular to the cone’s base. The sum of the distances of any point on an ellipse from two fixed points (called the foci) remains constant no matter where the point is on the curve. French, from Latin ellpsis, from Greek elleipsis, a falling short, ellipse, from elleipein, to fall short (from the relationship between the line joining the vertices of a conic and the line through the focus and parallel to the directrix of a conic) : en-, in; see en-2 + leipein, to leave; see leikw- in Indo-European roots.
