7.6


 * Surface area and volume of spheres

sphere:** the set of all points in space that are the same distance, r, from a given point known as the center of the sphere.
 * annulus:** the region between two circles in a plane that have the same center but different radii.


 * Volume of a sphere:** V = 4/3(pi)r³


 * Surface area of a sphere:** S = 4(pi)r²

SA= 4(pi)3² = 4(pi)9 =(9(pi))4 SA= 113.04

V= 4/3(pi)3² = 4/3(pi)9 = 37.98