Quadrilateral class 9 exercise 8.1 Q 6 | ABCD is a parallelogram and AP and CQ | #maths #shorts Quadrilaterals Class 9 Exercise 8.1 6. ABCD is a parallelogram and AP and CQ are perpendiculars from vertices A and C on diagonal BD show that (i) △APB≅ △CQD (ii) AP=CQ