What are you looking for on youre paper what letter
83 FT Because if you divide 786 by 12 (Which is how many inches are in a foot) you will get 65.5 ft.
Both ........................
If you divide the circumference C over the radius r, you get 2pi
2pi = C/r
this is because
C = 2pi*r
is one formula to find the circumference. Another formula is
C = pi*d
which works because d = 2r, ie the diameter is twice the radius.