In quadrilateral LMNO, it is given that LM=NO=9cm and LM∥NO. The diagonals LO and MN intersect at P.
a. (i) Prove that LMNO is a parallelogram.
b. (ii) Show that P is the midpoint of both the diagonals.
c. (iii) If LP=5cm, find the lengths of LO and PO."