An exterior angle of a triangle is 120°. One opposite interior angle is 45°. Find the other opposite interior angle.

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• A 45
• B 60
• C 75
• D 120

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Answer: C. 75

An exterior angle of a triangle equals the sum of the two opposite interior angles. So 120 = 45 + x, giving x = 120 - 45 = 75 degrees.

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