Chapter 12.2, Problem 25E

Find the exact lateral area of each solid in Exercise 40. Find the exact volume of the solid formed when the region bounded in Quadrant I by the axes and the lines x = 9 and y = 5 is revolved about the a) x-axis b) y-axis

Find the exact volume of the solid that results when the triangular region with vertices at 0, 0, 5, 0 and 0, 9 is rotated about the a x-axis b y-axis

A frustum of a cone is the portion of the cone bounded between the circular base and a plane parallel to the base. With dimensions are indicated, show that the volume of the frustum of the cone is V=13R2H13rh2