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The three vertices of a parallelogram are (3, 4), (3, 8) and (9, 8). Find the fourth vertex.

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Let A(3, 4), B(3, 8) and C(9, 8) be the given points

Let the forth vertex be D(x,y)

Since ABCD is a parallelogram and opposite sides of a parallelogram are equal

AB = CD and AD = BC

AB = CD

The fourth vertex is D(9,4)

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