If l,m,n are three parallel lines and the transversal t1 and t2 cut the lines l,m,n at the points A,B,C and P,O,R as shown in the figure, then
In the follow diagram, lines l, m and n are parallel to each other. Two transversals p and q intersect the parallel lines l, m and n at points A,B,C and P,Q,R respectively as shown below. Prove that ABBC=PQQR .