30. Exemplar Exercise Problems IV

If bisectors of \(∠A\) and \(∠B\) of a quadrilateral \(ABCD\) intersect each other at \(P\), of \(∠B\) and \(∠C\) at \(Q\), of \(∠C\) and \(∠D\) at \(R\) and of \(∠D\) and \(∠A\) at \(S\), then \(PQRS\) is a ______