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Three lines intersect at the vertex, labeled A. The first line is labeled D, the second line is labeled F, the third line is labeled H. D A H forms a ninety degree angle. A fourth line, labeled I B, intersects lines D, F, and H. The point where I B intersects D is labeled C. The point where I B intersects F is labeled E. The point where IB intersects H is labeled G. The measure of angle E C A equals forty-nine degrees. The measure of angle G A C equals ninety degrees. angle E C A and angle D C B are vertical angles. What is the measure of angle D C B?
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