any parallelogram can be dissected in n>=4 cyclic quadrilaterals.
Source: 2011 Saudi Arabia Pre-TST November 3.2 https://artofproblemsolving.com/community/c2745403_2011_
January 1, 2022
combinatorial geometrygeometrycyclic quadrilateral
Problem Statement
Prove that for each a parallelogram can be dissected in cyclic quadrilaterals.