Physics Direction?

Question

Vector V1 is 7.44 units long and points along the -x axis. Vector V2 is 4.39 units long and points at +55.0° to the +x axis.
I've figured:
V1x= -7.44
V1y= 0
V2x= 2.518
V2y= 3.596

magnitude= 6.0957

but i can't figure what the direction = ?° (counterclockwise from the +x axis is positive)

Answer 1

You have all 3 sides of the triangle. You can use arcsin, arccos, or arctan.