Answer:
B
Step-by-step explanation:
Equilateral because the sides are equal
To find cirfumfrence we use the formula C =

Soooo

= 3.14
r = 40 inches
So now we plug it in :P
C = 2 x 3.14 x 40 = 251.2
answer = B.) 251.2 inches
3/8 beacuse you would change that to a mix number