MathDB
Chords in a Circle [2011.II.10]

Source:

March 31, 2011
AMCAIMEtrigonometrygeometrycircumcircleanalytic geometrynumber theory

Problem Statement

A circle with center OO has radius 25. Chord AB\overline{AB} of length 30 and chord CD\overline{CD} of length 14 intersect at point PP. The distance between the midpoints of the two chords is 12. The quantity OP2OP^2 can be represented as mn\frac{m}{n}, where mm and nn are relatively prime positive integers. Find the remainder where m+nm+n is divided by 1000.