Answer: D. 72º
Explanation
Considering that F is the center of the circle, FA is the radii of the regular pentagon, , and FG is the apothem.
A pentagon, when divided into 5 triangles such as ABF:
We can calculate the measure of the angles such as ∠AFB as follows:
[tex]m\angle AFB=\frac{360}{5}=72\degree[/tex]
