PQRS is an isoceles trapezium. Lines are drawn joining R and S to the midpoint E of PQ. What triangle is RES? Why? Share with your friends Share 2 Lovina Kansal answered this Dear student In an isosceles trapezium parallel sides are equal in length and both anglescoming from a parallel side are equal.So, In △PES and △QERPS=QRPE=EQ E is a mid-point of PQand ∠P=∠QSo, △PES~△QER By SAS ruleThus, ES=ERSo,△RES is an isosceles. Regards 2 View Full Answer