CPM Homework Banner

Home > CALC > Chapter 4 > Lesson 4.4.1 > Problem 4-125


A horizontal flag is shown below. The radius of the outer semicircle is , while that of the inner semicircle is .

  1. Imagine rotating the flag about its pole and describe the resulting three-dimensional figure. Draw a picture of this figure on your paper.

    Imagine a hollow rubber ball. The rubber is -inch thick and the radius is inches.

  2. Find the volume of the rotated flag.

    Volume = big sphere − small sphere