Hello!
I believe that you mean 8π as the exact measure of the circumference. With that, we can find the exact area.
The formula for the area of a circle is: A = πr².
Thus, we need to find the diameter of the circle and divide it by 2 to find the radius.
To find the diameter of a circle given the circumference, use the formula: d = C / π.
d = 8π / π
d = 8
The radius is half of the diameter, so therefore, the radius is 4.
With that, we can find the exact area.
A = πr²
A = 4² · π
A = 16π
Therefore, the exact area of the circle is choice B, 16π.