Question

The surface area of a sphere is found using the formula 2003-05-04-00-00_files/i0230000.jpg, where r is the radius. If the surface area of a sphere is 2003-05-04-00-00_files/i0230001.jpg square feet, what is the radius, in feet?

Answer 1

the surface area of a sphere whose radius is R, is:
\[S=4\pi R ^{2}\]

Answer 2

so R is:
\[R=\sqrt{\frac{ S }{ 4 \pi }}\]