Long answer:
If you want to use web2.0 calculator:
Your sum is shorthand for ArcTan of (388/1150):
and assuming that you are working in 360 degrees,
Press "2nd" (which is going to select the inverse of what you press next):
then "Tan"
then (
then 388
then the symbol for "divide by", which shows up as "/"
then 1150
then )
then "="
Your answer is in degrees and decimals of degree.
