# Basketball rims have a diameter of 18 inches. If you want to put a band around a basketball rim, how much material to the nearest tenth of an inch will you need?

You would need 18$\pi$ inches of material, or 56.5 inches if rounded to the nearest tenth of an inch.
The formula for circumference is $\pi$d, meaning pi (~3.14) times the diameter of the circle. Plugging in 18 for d, you get $\pi$(18), which equals 56.548667...