Which of the following pairs of angles are supplementary?

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A 70°, 20°
B 70°, 30°
C 60°, 90°
D 100°, 80°

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Answer: D. 100°, 80°

Two angles are supplementary if they add up to 180 degrees. 100 + 80 = 180. 70 + 20 = 90 makes a complementary pair, not supplementary.

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Which of the following pairs of angles are supplementary?

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