given thatPQ=PR
∠PQR=∠PRQ
Because we know that angles opposite to equal sides are equal
∴∠Q=∠R
given that ∠R=50∘
Construct a quadrilateral PQRS in which PQ =4 cm, QR=5 cm, ∠P=50∘,∠Q=110∘ and ∠R=70∘