Answer:

Explanation:
We will find the shaded area if we subtract the area of the triangle from the area of the circle.
We know that the area of the circle is defined as

Where
is half the diameter, that is

The area of the circle is

Now, we have to find the area of the triangle, which is defined as

Where
is the base of 16 feet, and
is the height of the triangle which is on the radius. So, we have
and
.
The area of the triangle is

Now, the shaded is the difference as we said before, that is

Replacing both areas, we have

Therefore, the shaded area is
