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

AB = =

BC = =

CD = =

AD = =

Slope AB =

Slope BC =

Slope CD =

Slope AD =

As opposite sides are equal and parallel, it forms a parallelogram.

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