The Formula to find the Area of a circle using the radius is:
[tex]A = \pi r^2[/tex]
r = 8
So:
[tex]A = \pi r^2[/tex]
[tex]A = \pi 8^2[/tex]
[tex]A = \pi64[/tex]
And you get about 201.06193
So, the area of a circle with a radius of 8 is about 201.06
Hope this Helps :)