If the diameter of a circle is 8 what is pi r2

[tex] {Radius = Diameter / div 2 / newline Radius = 8 / div 2 / newline Radius = 4 / newline / newline Area = / pi r^2 / newline Area = / pi / times 4^2 / newline Area = / pi / times 16 / newline / underline{/underline{Area = 50.27 (2d. p) }}}

the answer is 100.53