The period is the amount it time it takes to make one complete cycle. If we start at 0 for simplicity sake, the graph is at its maximum point. It reaches its maximum point again at 3, this is one complete cycle and thus the period is 3.
Start by finding the area of one of the stools with this formula: A=(3.14)(12)(12) Then multiply that answer by five, since there are 5 stools. Hope this helps :) good luck
