Maths- Ellipse by Utkarsh Dubey - Tuesday, 3 November 2009, 8:56 PM Number of replies: 0 ABCD is a convex quadrilateral and the diagnols intersect at P.Consider an ellipse E1 passing through P with A & B as foci and ellipse E2 with C & D as foci.Prove that E1 and E2 touch each other. Please Help! Permalink Reply