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Three consecutive vertices of a parallelogram are (-2, -1), (1, 0) and (4, 3). Find the fourth vertex.

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 Let A(-2, -1), B(1, 0) and C(4, 3) and D(x,y) be the vertices of a parallelogram ABCD taken in order.

Since the diagonals of a parallelogram bisect each other.

Therefoer, Coordinates of the mid - point of AC = Coordinates of the mid-point of BD.

Hence, fourth vertex of the parallelogram is (1, 2)

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