Question

i need answer in steps. plzz answer fastlyyy

Answer 1

If PQR = PRQ a then these angles are also equal and the exterior angle will also equal because if two interior angles are equal then the exterior angle of them will be also equal.
Hence exterior angle PQS and PRT are equal.
If PQR and PRQ are equal then Q and R are equal.
By angle sum property P = 40°