Answer :

According to the distance formula, the distance 'd' between two points (a,b) and (c,d) is given by
.....(1)


Slope of a line between two points (a,b) and (c,d) is



Note: If the Product of slopes of two lines = -1 then they are perpendicular to each other.


PQ = =


QR = =


RS = =


SP = =


Slope PQ =


Slope QR =


Slope RS =


Slope SP =


As opposite sides are equal and parallel and perpendicular to each other, points form a rectangle.


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