As per given by the question,
There are given that a quadrilaterals.
Now,
There are also given that ,
Then,
From the properties of the rectangle;
First: the sum of its internal angles is 360 degree,
That means, all the angle of a rectangle are 90 degree.
Second: Opposite sides of a rectangle are equal and parallel.
Third: Diagonals of a rectangle bisects each other.
Now,
From the given properties;
Now,
According to the given properties,
The given figure PQRS is a rectangle.
That means,
All angles are 90 degree,
So;
Then,
Sum of any two angle is 190 degree.
And,
The opposite sides of the rectangle are equal and parallel.
Hence, PQRS is a rectangle.