Question 617638
I = (180(n-2))/n


160 = (180(n-2))/n


160n = 180(n-2)


160n = 180n-360


160n - 180n = -360


-20n = -360


n = -360/(-20)


n = 18



So the solution is n = 18, which means that there are 18 sides.