Proposed by Daniel Sitaru-Romania
https://www.cut-the-knot.org/m/Geometry/InequalityInCyclicQuadrilateral4.shtml
Solution by proposer
Published by Alexander Bogomolny-USA
Proposed by Daniel Sitaru-Romania
https://www.cut-the-knot.org/m/Geometry/InequalityInCyclicQuadrilateral4.shtml
Solution by proposer
Published by Alexander Bogomolny-USA