In parallelogram PQRS a diagonal PR is drawn.
(i) List the pairs of opposite sides and the pairs of opposite angles of the parallelogram.
(ii) Using only the basic definition of a parallelogram and its properties of opposite sides and opposite angles, explain why ∠QPR and ∠SRP are equal.
(iii) Based on your answer to part (ii), give a reasoning (without writing a formal congruence proof) to show that triangles △PQR and △RSP have the same area.