An exterior angle of a triangle is 125°. One of its opposite interior angles is 48°. What is the other opposite interior angle?

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A 77
B 48
C 125
D None of the above

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Answer: A. 77

An exterior angle of a triangle equals the sum of the two opposite interior angles. So 125 = 48 + x, which gives x = 125 - 48 = 77 degrees.

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An exterior angle of a triangle is 125°. One of its opposite interior angles is 48°. What is the other opposite interior angle?

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