I'm not sure what you want with the first part (3/1=6/2)
well PEMDAS or parenthasees exponents, mult or division whichever comes first, addition subtraction, whichever comes first so
3-1/1 would be divison first
1/1=1
3-1=2
If the radius (r) is 36 inches, the circumference of the circle is C = 2pi r,
or C = 2pi(36 inches) = 72pi inches. Please note: that's pi, not pie.