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Triangles (part 2) When the sides of a triangle are extended . . . Exterior angles—the angles that form a linear pair with the interior angles Exterior Angle Theorem The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles. B 1 A C Find the value of x. Then find the measure of the exterior angle shown. 8 x° 38° 1 Triangles (part 2) Find the value of x. Then find the measure of the exterior angle shown. (3x + 15)° (6x – 10)° (8x + 18)° 2