6.2.48 Find the volume of the described solid. A frustum of a right circular cone with height h

6.2.48 Find the volume of the described solid. A frustum of a right circular cone with height h

Problem 6.2.48 From James Stewart's Single Variable Calculus - Early Transcendentals 7th edition from chapter 6, applications of integration - volumes. Enjoy, and I am available for tutoring and private classes! :) Find the volume of the described solid S. A frustum of a right circular cone with height h, lower base radius R and top radius r