SOLUTION: 10. Two angles of a triangle have measures of 45° and 75°. Which of the following could not be a measure of an exterior angle of the triangle? 60° 105° 135°

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Question 596355: 10. Two angles of a triangle have measures of 45° and 75°. Which of the following could not be a measure of an exterior angle of the triangle?

60°
105°
135°
120°


Answer by Alan3354(30983) About Me  (Show Source):
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10. Two angles of a triangle have measures of 45° and 75°. Which of the following could not be a measure of an exterior angle of the triangle?

60°
105°
135°
120°

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Find the 3rd angle.
Then subtract each of the 3 angles from 180 to find the exterior angles.