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Triangle, with sides extended as rays: left side, extends up & left, right side, extends down & right, bottom side, extends down & left, creating 3 sets of linear pairs labeled as follows: bottom left, exterior, a, interior 48 degrees, bottom right, exterior, b, interior, 72 degrees, top, exterior, c, interior unlabeled.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?

Use similar methods to calculate and .