Applying the definition of sum of triangle, the third angle measure is: C. 102°
Recall:
- Sum of a triangle/sum of all interior angles in a triangle = 180 degrees
Thus, given that a triangle has two angles that measures, 13 degrees and 65 degrees respectively, therefore, the third angle of the triangle can be calculated as follows:
Third angle = 180 - (13 = 65) (Sum of Triangle).
Third angle = 180 - 78
Third angle = 102 degrees.
Therefore, applying the definition of sum of triangle, the third angle measure is: C. 102°
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