Radius for turn Formulae

[coyoteugly]

Here is the formulae I have for radius of turn:

r=V^2/(11.26*tanTHETA)
question: the value for V in V^2; is that to be in ft. per second or Knots per hour?

The second formula:
r=V^2/(32.2*tanTHETA)

I tried both of these and came up with diferent answers with each. Can anyone shed some light, perhaps with a full explanation of units required or a different formula?

Thanks