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Can someone also explain how to get the answer?

Can someone also explain how to get the answer?-example-1
User Gaumann
by
7.6k points

2 Answers

3 votes
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}
Can someone also explain how to get the answer?-example-1
User Vince Varga
by
7.8k points
5 votes

((n-2)\cdot180)/(n)\\\\ ((18-2)\cdot180)/(18)=16\cdot10=160
User HPP
by
8.8k points

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