LaTeX: \angle∠J and LaTeX: \angle∠K are supplementary angles. If mLaTeX: \angle∠K is 84LaTeX: ^\circ∘, what is the measure of LaTeX: \angle∠J?
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Answer :

180-84=96
The first angle is 84. We know that supplementary angles equal 180. Therefore to find the second angle we just have to take away 84 from 180.

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