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4.1 Lines, Angles, and Triangles - Triangle sum theorem
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The figure presents a triangle. The bottom side is horizontal, the left side slants upward and slightly to the left, and the right side slants downward and to the right. The bottom left angle of the triangle measures 2 b degrees. The top angle of the triangle measures 31 degrees. The bottom right angle of the triangle measures a, degrees.

In the triangle above, a, equals 45. What is the value of b ?

A.

52

B.

59

C.

76

D.

104