Question

calcule a soma dos angulos internos dos poligonos pentadecágono(15 lados)

Answer 1

Sn=180(n-2)
Sn= 180(15-2)
Sn= 180*13
Sn= 2340

Answer 2

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

$\sf S_i=(15-2)\cdot180^\circ$

$\sf S_i=13\cdot180^\circ$

$\red{\sf S_i=2340^\circ}$