What is the sum of the interior angles of a polygon having 8 sides?

Question: What is the sum of the interior angles of a polygon having 8 sides?

(1)1000

(2)1060

(3)1088

(4)1080

Answer (4) is absolutely right answer because we know that the sum angle of the structure is 180(n-2)

And the n is number of sides. So that 180(8-2)=1080