Question

Qual e a soma dos ângulos internos de um undecagono?
A)1520
B)1620
C)1420
D)1720

Answer 1

si = (n -2).180

si = (11 -2).180

si = (9). 180

si = 1620°✓

Answer 2

$\sf S_i=(n-2)\cdot180^\circ$

$\sf S_i=(11-2)\cdot180^\circ$

$\sf S_i=9\cdot180^\circ$

$\red{\sf S_i=1620^\circ}$

Letra B