Question

Ache o valor e soma dos ângulos internos e a diagonal do polígono regular dodecágono

Answer 1

si = (n-2).180
si = (12-2).180
si = (10). 180
si = 1800°

Answer 2

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