Y by
Let the intersection of the diagonals
and
of the convex quadrilateral
be point
. Let
be the midpoint of
and
be the midpoint of
. It's known that
bisects
. Prove that
is cyclic if and only if
is cyclic.












This post has been edited 1 time. Last edited by Marinchoo, Mar 17, 2022, 7:29 PM