Question

A tire has a radius of 13 inches. how far does the tire travel every time it turns exactly once? use 3.14 for pi and round your final answer to one decimal place.

Answer 1

If we were to put a distinguishing mark on a specific random place on the tire, right at the point where the tire meets the ground for example, when the car starts moving, the tire has made one full revolution when that same mark meets the ground again. That is also known as the circumference of a circle...one time around the circle. The formula for the circumference of a circle is

$C=2\pi r$.

We are given a radius of 13 inches and are told to use 3.14 for pi. That means that our formula looks like this:

$C=2(3.14)(13)$ and C = 81.6 inches, That's how far the tire travels every time it turns exactly once.