Y by Maths_Guy, Adventure10, Mango247, ItsBesi
In convex quadrilateral
, the diagonals
and
meet at the point
. We know that
and
. If we have
prove that
.
Proposed by Iman Maghsoudi








Proposed by Iman Maghsoudi
This post has been edited 1 time. Last edited by parmenides51, Sep 20, 2018, 9:22 AM
Reason: Proposed
Reason: Proposed