### Home > GB8I > Chapter 3 Unit 4 > Lesson INT1: 3.1.1 > Problem 3-8

3-8.

The three-dimensional shape at right is called a **cylinder**. Its bottom and top bases are same-sized circles, and its “side” is perpendicular to the bases. What would the shape of a flag need to be in order to generate a cylinder when it spins about its pole? (You may want to refer to problem 3-3 to review how flags work.)

The flag would have to be a rectangle. The height of the cylinder would be the same as the height of the rectangle, and the cylinder's radius would be the same as the width of the rectangle.