disputeanocean disputeanocean
  • 18-07-2016
  • Mathematics
contestada

can someone also explain how to get the answer?

can someone also explain how to get the answer class=

Respuesta :

konrad509
konrad509 konrad509
  • 18-07-2016
[tex]\dfrac{(n-2)\cdot180}{n}\\\\ \dfrac{(18-2)\cdot180}{18}=16\cdot10=160[/tex]
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dalendrk
dalendrk dalendrk
  • 18-07-2016
Look at the picture

[tex]\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}[/tex]
Ver imagen dalendrk
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