Help with VB code

[bsharp]

I am trying to code this in Macro

Cos(theta) = A · B / (|A| * |B|)
Sin(theta) = |A × B| / (|A| * |B|)

But what does this do in VB?
V = x2 - x1, y2 - y1
Will it add the two sums together?

http://vb-helper.com/howto_find_angles.html