First, we need to substitute the radius into the formula for surface area.
[tex]4\pi 6^{2}[/tex]
[tex]6^{2}=36[/tex]
[tex]4\pi 36[/tex]
[tex]36*4=144[/tex]
[tex]144\pi =452.3893421...[/tex]
[tex]rounded=452.4[/tex]
if you need to use 3.14 as pi (instead of the pi button) then
[tex]144*3.14=452.16[/tex]
Hope this helps :-)