Question

A soma dos ângulos internos de um polígono regular de 22 lados é:
2800°
3000°
3600°
4200°

Answer 1

$\Large\displaystyle\begin{gathered} \tt S_i=(n-2)\cdot180^\circ\end{gathered}$

$\Large\displaystyle\begin{gathered} \tt S_i=(22-2)\cdot180^\circ\end{gathered}$

$\Large\displaystyle\begin{gathered} \tt S_i=20\cdot180^\circ\end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\tt \red{S_i=3600^\circ}} \end{gathered} }$