List of top Mathematics Questions on Cyclic Quadrilaterals asked in TS POLYCET

The parallelogram circumscribing a circle is a:
A circle touches the sides of a quadrilateral ABCD at points P, Q, R and S then which of the following is true?
A circle touches the sides of a quadrilateral ABCD at points P,Q,R and S then which of the following is true?
If A, B, C, D are angles of a cyclic quadrilateral, then sin A + sin B - sin C - sin D =?