MathDB
2015-2016 Spring OMO #22

Source:

March 29, 2016
Online Math Open

Problem Statement

Let ABCABC be a triangle with AB=5AB=5, BC=7BC=7, CA=8CA=8, and circumcircle ω\omega. Let PP be a point inside ABCABC such that PA:PB:PC=2:3:6PA:PB:PC=2:3:6. Let rays AP\overrightarrow{AP}, BP\overrightarrow{BP}, and CP\overrightarrow{CP} intersect ω\omega again at XX, YY, and ZZ, respectively. The area of XYZXYZ can be expressed in the form pqr\dfrac{p\sqrt q}{r} where pp and rr are relatively prime positive integers and qq is a positive integer not divisible by the square of any prime. What is p+q+rp+q+r?
Proposed by James Lin