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
Soooo
r = 40 inches
So now we plug it in :P
C = 2 x 3.14 x 40 = 251.2
answer = B.) 251.2 inches