PQRS is a trapezium in which PQ is parallel to SR. LM is the line joining midpoints of PS & QR respectively.prove that LM=half (PQ + SR). Share with your friends Share 1 Pooja Khanna answered this Refer the following link : https://www.meritnation.com/ask-answer/question/that-lm-parallel-to-ab-prove-that-lm-1-2-ab/quadrilaterals/1354949 -2 View Full Answer