Question

Considere um icosagono regular e calcule.A soma das medidas dos ângulos internos?

Answer 1

S = 180(n - 2)
S = 180(20 - 2)
S = 180(18)
S = 3240

Answer 2

$\large\displaystyle\boxed{\begin{array}{l} \sf \: S_i = (n - 2) \cdot180 {}^{ \circ} \\ \\ \sf \: S_i = (20 - 2) \cdot {180}^{ \circ} \\ \\ \sf \: S_i = 18 \cdot180 {}^{ \circ} \\ \\ \boxed{ \boxed{ \sf{S_i = 3240 {}^{ \circ} }}}\end{array}}$