ssupermath
Joined: 12 Nov 2004Posts: 10

Posted: Sat Dec 18, 2004 4:44 am Post subject: diagonals



Let ABCD be a convex quadrilateral and all sides of it are constant.AC and BD diagonals intersect at P point.Prove that the sum of AC and BD diagonals are maximum iff 1/AP +1/PC =1/BP+1/PD.
Find a formula for the maximum and minumum value of the sum of AC and BD diagonals.

