If you had a polygon with 17 sides, how could you find the sum of the angles in it without measuring them

Question

If you had a polygon with 17 sides, how could you find the sum of the angles in it without measuring them? What would this sum be?

Answer 1

The sum of the number of angles in a polygon is (n-2) * 180, where n is the number of sides, so the sum of the angles of an 17-sided polygon is (17-2) * 180 = 2700.