At the park there is a pool shaped like a circle. A ring-shaped path goes around the pool. Its inner diameter is 14 yd and its outer diameter is 18yd.
We are going to give a new layer of coating to the path. If one gallon of coating can cover 4yd squared, how many gallons of coating do we need? Note that coating comes only by the gallon, so the number of gallons must be a whole number. (Use the value 3.14 for .)
