Direction of a Vector

Direction of a vector. Let's say that we have this submerged structure under a water, right? I got to know two components, either F of x or F of z, or F, one of the two components, for me to find the particular angle or the direction of the vector, right? And let's pretend that I know, let's say, Fz and Fx, right? In that case, I can write tangent of alpha will be Fz by Fx. From that, I will be able to find my angle. How did I get that? Well, this is the Fz as well, right? Fz. That's the tangent, tangent. So this divided by Fx. Or let's say that I know Fz and F, right? So I can use sine of alpha, so some kind of a geometry, Fz divided by F. How did I get that? Sine is this divided by this, right?