Answer :

konrad509
[tex]\dfrac{(n-2)\cdot180}{n}\\\\ \dfrac{(18-2)\cdot180}{18}=16\cdot10=160[/tex]
dalendrk
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]
${teks-lihat-gambar} dalendrk

Other Questions