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4. Angles A and B are supplementary. If mA = 67, find mB

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Answer:

113 degrees

Explanation:

Two angles are called supplementary when they add up to 180 degrees


180 = x + y \\ 180 = 67 + y \\ y = 180 - 67 \\ y = 113 \\ therefore \: mB \: = 113

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