Question

1) Quanto vale a soma dos ângulos internos de um dodecágono?

Usar: Si = ( n - 2) . 180​

Answer 1

Si = ( n - 2) . 180

Si = ( 12 - 2) . 180

Si = ( 10) . 180

Si = 1800⁰ ✓

Answer 2

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