2018 JBMO Problems
Problem 4
Let and ,, the symmetrics of vertex over opposite sides.The intersection of the circumcircles of and is . and are defined similarly.Prove that lines , and are concurent.
Let and ,, the symmetrics of vertex over opposite sides.The intersection of the circumcircles of and is . and are defined similarly.Prove that lines , and are concurent.
Something appears to not have loaded correctly.