Find the area of each shaded
A circle has a total measure of
. To find the area of the shaded sector, you must find the fraction of the circle that is shaded.
If the smaller angle of the non-shaded area is
, the shaded portion's angle must be . as a portion of
This portion represents the fraction of the area that the shaded sector represents in the circle.
The area of a circle is
ft for the radius, we get about ft for the total area of the circle. of ft about ft
See part (a).