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If m<10=77, m<7=47 and m<16=139, find the measure of the missing angle m<9=?

If m<10=77, m<7=47 and m<16=139, find the measure of the missing angle m-example-1
User Faramka
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we have angle 9 and angle 10 are collateral angles, this means that they are supplementary, i.e. they add up to 180°. Therefore:


\begin{gathered} m\angle9+m\angle10=180 \\ m\angle9+77=180 \\ m\angle9+77-77=180-77 \\ m\angle9=103 \end{gathered}

answer: m<9 = 103°

User Jan Krakora
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