Question

Qual a soma dos ângulos internos de um icosagono?

Answer 1

Dada a fórmula S = (n – 2 )*180º, temos:

S=(20-2)*180

S=18*180

S=3240º

Answer 2

$\large\boxed{\begin{array}{l}\sf S_i=(n-2)\cdot180^\circ\\\sf S_i=(20-2)\cdot180^\circ\\\sf S_i=18\cdot180^\circ\\\sf S_i=3240^\circ\end{array}}$