In a quadrilateral PQRS, PQ = RS and QR = SP and one angle between two adjacent sides is 90°.
The quadrilateral is definitely a
Rectangle
In quadrilateral PQRS, it is given that PQ = RS and QR = SP.
∴ PQRS is a parallelogram.
[In quadrilateral, if opposite sides are equal and parallel, then the quadrilateral is a parallelogram]
It is also given that in PQRS, one angle between two adjacent sides is 90°.
∴ PQRS is a parallelogram.
[Parallelogram where one of the angle between two adjacent sides is 90° is a rectangle]