Question 822720
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Hi,
If a sphere has a diameter of 18in(radius=9in) then what would the surface area be??
<img src='http://img69.imageshack.us/img69/7421/spherem.png' border='0'/></a>
Using {{{pi = 3.14}}} as approximate
Surface area ={{{ 4pi*r^2 = highlight_green(4)(3.14)(81in^2)}}} = 1017.4 in^2