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

ANSWER IT AS SOON AS POSSIBLE.

Let A(3, 4), B (3, 8) and C(9, 8).

Let D (x, y) be the fourth vertex of the parallelogram ABCD.

Since, the diagonals of parallelogram bisect each other at O.

∴ Mid point of BD = Mid point of AC

Thus, (9, 4) is the fourth vertex.