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In the diagram at right, what are the measures of the exterior angles of the triangle, which are labeled and ? What is the sum of the exterior angle measures?

Triangle, with sides extended as rays, & angles exterior to triangle, labeled as follows: left side, extends up, angle labeled, c, right side, extends down & right, angle labeled, b, bottom side, extends down & left, angle labeled, a. Interior Triangle bottom left angle labeled, 48 degrees, & bottom right angle labeled, 72 degrees.

Use similar methods to calculate and .