One advantage of the prismoidal formula is that you can use it to a. calculate surface area for cylindrical rings. b. estimate the surface area of edged non-prismoidal solids. c. determine volumes of prismoids and estimate volumes of edged non-prismoidal solids. d. calculate volume of spheres.

The prismoidal formula gives the volume of prismatoid. Prismatoid is a solid where all vertices lie on two parallel planes.It is not a universal formula for computing the volumes of solids. You can calculate precise volumes of all prismoids , and that is its advantage. so, the answer is A. Calculate surface area for cylindrical rings.