To prove: Quadrilateral PQRS is a parallelogram.

Explanation of Solution
Given information:Coordinates of the end points of quadrilateral are
Formula used:If
(a) Slope of line
(b) Length of the line
Proof: Slope of the line joining points
Now, slope of the line joining points
So, we have
i.e., slopes of lines PS and QR is equal which means
Let us calculate the lengths of line PS and QR by using equation (ii)
Length of the line PS
Similarly, length of the line QR
So, we have
i.e., length of lines PS and QRarecongruent to each other.
Thus,
Hence, a pair of opposite sides are congruent and parallel to each other so the given quadrilateral PQRSis a parallelogram.
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