Determine the central and base angle of a 30-gon?

Question

I have this question on my review and I do not understand can I get any help?

Answer 1

To calculate the central angle visualize a circle in the center of the polygon. A circle has 360 degrees. Divide 360 by the number of sides and that will tell you the central angle size. So 360 divided by 30 equals 18 degrees.

To find the base angle use this formula

180(n-2)/n where n is the number of sides of a regular polygon.

When you plug in 30 for n

You should get 168 degrees for each base angle.