Question

A wet bicycle tire leaves a trace of water on the floor. The tire has a radius of 14 inches, and the bicycle wheel makes 3 full rotations before stopping. How long is the trace of water left on the floor?

Give your answer in terms of pi.

Answer 1

The length of the trace of water will be 84 pi inches.

The distance around one tire rotation, circumference, is equal to pi times the diameter.

In this case, our radius is 14, so the diameter is 28. That makes the circumference 28 pi.

We have 3 full rotations, so multiply 28 by 3 to get 84 pi inches.