MathDB
through the midpoint of $OH$

Source: 2012 CWMO P5

September 30, 2012
geometrycircumcircletrapezoidratioparallelogram

Problem Statement

OO is the circumcenter of acute ΔABC\Delta ABC, HH is the Orthocenter. AD⊥BCAD \bot BC, EFEF is the perpendicular bisector of AOAO,D,ED,E on the BCBC. Prove that the circumcircle of ΔADE\Delta ADE through the midpoint of OHOH.
Back to ProblemsView on AoPS