Well, if your calculating the circumference, you have to figure out the radius, which is 18/2, so it would be 9. Once you have the radius, you can figure out the circumference, and the equation is C = 2 \pi r. Plug in the numbers, and the answer you get is 56.5487!
Sanitation Costs (per pound) Recycling $30 Landfilling $50 Burning $75 2,000 pounds = 1 ton/ $25 per ton / $25 per pound / $45 per ton / $45 per pound
