9. Regular octagon ABCDEFGH is inscribed in a circle, as shown below. The sector of the circle bounded by radii AJ and DJ and by is shaded. The area of the shaded sector is what fraction of the area of the circle?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

The central angles corresponding to each side of the regular octagon are equal, the central angle/2π=Ssector/Scircle, because the central angle is 3/ of 2π 8, so the sector area is 3/8 of the circle area