I am having trouble with a problem

Vectors a and b are at right angels. Determine the magnitude and direction of the resultant relative to vector A

A=33.7 and B=17.5

What I know:

R = /sqrt33.72+17.52

R=38

So I know that the resultant magnitude is 38.

Now I need to find the resultant direction..... This is the part I am getting hung up on

I know that Tan0= B/A

I know that Tan0 = 17.5/33.7

I know that Tan0 = 0.519

I DONT know how to get 0 in degrees from tan0 = 0.519.