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

4-125.

A horizontal flag is shown below. The radius of the outer semicircle is 4, while that of the inner semicircle is 3. Homework Help ✎

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

Find the volume of the rotated flag.

Imagine a hollow rubber ball. The rubber is 1-inch thick and the radius is 3 inches.

Volume = big sphere − small sphere