Question

Find the sum of interior angles a polygon has with the given number of sides a.9 b.19

Answer 1

The equation for this is (n-2) x 180

Replace n with the number of sides:

a. 9:  (9-2) x 180 = 7 x 180 = 1,260

b. 19: (19-2) x 180 = 17 x 180 = 3,060