Answer:
c ≈ 26.39 yd
Explanation:
The circumference of a circle can be found by multiplying the radius by 2 by pi or by multiplying the diameter by pi.
-> Since they give us the radius, I will use the more-known equation of 2πr
[Given]
c = 2πr
[Plug-in the value of r]
c = 2π(4.2 yd)
[Simplify]
c = 8.4yd * π
[Multiply]
c ≈ 26.39 yd