One advantage of the prismoidal formula is that you can use it to

Question

A. determine volumes of figures that aren't prismoids.
B. estimate the volume of solids that are combinations of other solids.
C. calculate precise volumes of all prismoids.
D. calculate both volume and surface area.

Answer 1

google's first hit answers your question. Too bad you couldn't be bothered.

https://www.algebra.com/algebra/homework/Bodies-in-space/Bodies-in-space.faq.question.975480.html