Angles A and B are supplementary.
If m∠A=78° what is m∠B
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The measures of supplementary angles add up to 180∘. So if m∠A=78∘, then the measure of angle B must be m∠B=180∘−m∠A=180∘−78∘=102∘
Angles A and B are vertical angles.
If m∠A=104∘ what is the m∠B?
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