We are given that the neighborhood where Vincent lives has round-abouts and he rides his bike once around the very edge of the grassy circle. Let's take a look at the diagram.
As we can see, the diameter of the grassy circle is 3 yards. Now, let's recall that the circumference of a circle is the product of the diameter and pi.
C= 3π ≈ 9.42
The circumference of the grassy circle is approximately 9.42 yards. Since we are asked to write an answer in feet let's convert yards to feet using the fact that there are 3 feet in one yard.
9.42yd= 9.42*3ft≈ 28.3ft
He will have ridden approximately 28.3 feet.
