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Komok [63]
3 years ago
10

Can someone also explain how to get the answer?

Mathematics
2 answers:
max2010maxim [7]3 years ago
8 0
\dfrac{(n-2)\cdot180}{n}\\\\
\dfrac{(18-2)\cdot180}{18}=16\cdot10=160
kherson [118]3 years ago
4 0
Look at the picture

\beta=360^o:18=20^o\\\\2\alpha+\beta=180^o\ (a\ triangle)\\\\2\alpha+20^o=180^o\ \ \ |subtract\ 20^o\ from\ both\ sides\\\\2\alpha=160^o\\\\2\alpha\ is\ an\ interior\ angle.\\\\Answer:\boxed{160^o}

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lara31 [8.8K]

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answers are below

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