Answer:
A. 31 Km
Step-by-step explanation:
[tex]circumference = 2\pi \:r[/tex]
radius equals the diameter divided by 2
[tex]r = \frac{d}{2} [/tex]
In this case the diameter is 10, so the radius is 5.
finally,
[tex]2\pi(5) = 31.415[/tex]
rounded to the nearest whole number gives us
31 Km.
