PQR PQR\,PQR is a triangle. RUST RUST\,RUST is a parallelogram such that S S\,S is the midpoint of PQPQPQ, T T\,T is the midpoint of PRPRPR, and U U\,U is the midpoint of QRQRQR.
Prove that triangle PST PST\,PST is congruent to triangle SQUSQUSQU.