Angle(AOB) = 360o - 215o = 145o.
The radius of the circle appears to be slightly larger than 3, so the area of the whole circle is
slightly larger than pi·32 or a little more than 9 pi.
Since the central angle is 145o, the area that we want is slightly more than
145/360·9pi = 11.4 square units.
The closest answer seems to be 11 square units.