Respuesta :
To find the answer you need to use the formula (n-2)180=sum with n being the number of sides of the polygon.
(n-2)180=540
180n-360=540
180n=900
n=5
so the polygon has 5 sides
(n-2)180=540
180n-360=540
180n=900
n=5
so the polygon has 5 sides