if two parallelograM pqad and pqbc are on the opposite side of pq prove that abcd is a parallelogram quick Share with your friends Share 6 Varun.Rawat answered this Since PQBC is a ∥gm, thenPQ∥CB; PC∥QB ......1PQ = CB; PC = QB .......2 Opposite sides of∥gm are equalSince PQAD is a ∥gm, thenPQ∥DA; PD∥QA ......3PQ = DA; PD = QA .......4 Opposite sides of∥gm are equalNow, from 3 and 4, we get PQ = CB; PQ = DA ⇒ CB = DA ......5Now, from 1 and 2, we getPQ∥CB; PQ∥DA⇒ CB ∥ DA ........6In quad. ABCD, we have CB ∥ DA using 6CB = DA using 5⇒ABCD is a ∥gm In a quadrilateral, if a pair of opposite sides is equal and parallelthen quadrilateral is a ∥gm 11 View Full Answer