Answer: 197.82 yards
Step-by-step explanation:
The formula for finding the circumference of a circle is 2*π*r
or D*π. Since for this question, we have the radius, we would be using 2*π*r. We know the radius, 31 1/2, so we turn that into an improper fraction which equals 63/2, and then we would times that by π(3.14).
Which then equals to 197.82/2. 197.82 divided by 2 equals to 98.91. But then we would need to times that by 2 (2*π*r), which would at last give us 197.82(yards).
Note: There are other ways you could have done this, but I chose this way because I just found this quicker, but this is only my opinion.