In quadilateral pqrs,pq=ps and pr bisect ∆pShow that ∆pqr=~ ∆prs.What

This question was asked in Ex 7.1, 1

In quadilateral pqrs,pq=ps and pr bisect ∆p
Show that ∆pqr=~ ∆prs.
What can you say about qr and sr ?