In figure, PQRS and ABRS are parallelograms and X is any point on side BR. Show that
We can clearly see that ABRS and PQRS are the parallelograms on the same base SR and between the same parallels PB and SR.
We have already proved that (1)
We can also note that and parallelogram ABRS are on the same base AS and between the same parallels AS and BR.
From (1) and (2), we can say that