Here is the formula:
d=C/[tex] \pi [/tex]
Dividing fractions is the same as multiplying the reciprocal, but inorder to multiply fractions you need to convert the mixed number to an improper fraction. so .....
Formula for mixed numbers to improper fraction is:
(whole number*denominator)+numerator and you put your answer over the denomiator.
Solving everything
37 5/7 = 264/7
264/7*7/22 (reciprocal of 22/7)=
1848/154=
12