MathDB
2021-22 Winter Team #10

Source:

April 17, 2022
geometry

Problem Statement

In triangle ABCABC, let OO be the circumcenter. The incircle of ABCABC is tangent to BC\overline{BC}, CA,\overline{CA}, and AB\overline{AB} at points D,ED, E, and FF, respectively. Let GG be the centroid of triangle DEFDEF. Suppose the inradius and circumradius of ABCABC is 33 and 88, respectively. Over all such triangles ABCABC, pick one that maximizes the area of triangle AGOAGO. If we write AG2=mnAG^2 =\frac{m}{n} for relatively prime positive integers mm and nn, then find mm.