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(i) In △DAC , S is the mid point of DA and R is the mid point of DC. Therefore, SR∥AC and SR=
2
1
AC.By mid-point theorem.
(ii) In △BAC , P is the mid point of AB and Q is the mid point of BC. Therefore, PQ∥AC and PQ=
2
1
AC.By mid-point theorem. But from (i) SR=
2
1
AC therefore PQ=SR
(iii) PQ∥AC & SR∥AC therefore PQ∥SR and PQ=SR. Hence, a quadrilateral with opposite sides equal and paralle is a parallelogram. Therefore PQRS is a parallelogram.
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