### Home > CCG > Chapter 11 > Lesson 11.1.1 > Problem 11-13

11-13.

Three flags are shown below on flagpoles. For each flag, determine what shape appears if the flag is spun very quickly about its pole. If you do not know the name of the shape, describe it.

Try sketching the 3D shape rotating around the pole.

a sphere

a cylinder with a cone top and bottom

a double-cone: two cones attached at the vertices