How get angle between hypotenuse' direction and 1 cathet in 3D?

Hello, I need find angle in 3Dimensions, but the only things I can get is directilon of hypotenuse, 1 cathet, and where they are intersected. It looks like this:
image
Can someone tell me how I can find angle?

Trigonometry. In this case, you will have to divide your hypotenuse by your cathet. You’ll get a cosinus. You can then reverse trig with math.acos to get the angle.

The problem is that I know only direction of hipotenuse, not it’s lenght. (Also I found second cathet direction, but not lenght again.)

Well if you know the direction you pretty much know the angle value

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