Question

A soma dos ângulos internos de um dodecágono é igual a:

a)1700°
b)1800°
c)1900°
d)2000°
​

Answer 1

$\large\boxed{\begin{array}{l} \sf \:S_i = (n - 2) \: . \: 180 {}^{ \circ} \\ \\ \sf \:S_i = (12 - 2) \: . \: 180 {}^{ \circ} \\ \\ \sf \: S_i = 10 \: . \: 180 {}^{ \circ} \\ \\ \boxed{ \boxed{ \sf{S_i = 1800 {}^{ \circ} }}}\leftarrow\textsf{Letra B}\end{array}}$