Given that the surface area of the sphere is S(x)=4πx², the inverse function will be obtain as follows: make x the subject of the function S(x)/(4π)=x² get the square root of both sides: x=√[S(x)/(4π)] replace x by S⁻¹(x) and S(x) by x this will give us the inverse as : S⁻¹(x)=√[x/(4π)] The above implies that the inverse is the square root of the radius divided by 4π
