Find the angles between two solids

Question

I have 2 solids (A and B) and I need to find the three angles between their x, y, and z axes. If I calculate the geometrical center of the two solids (Ax, Ay, Az and Bx, By, Bz), is it correct to calculates the angles between their axes as follow?

Thank you

$\Delta x = Ax - Bx$

$\Delta y = Ay - By$

$\Delta z = Az - Bz$

$\angle x = a\tan 2(\Delta x, \sqrt{\Delta y^2 + \Delta z^2})$

$\angle y = a\tan 2(\Delta y, \sqrt{\Delta x^2 + \Delta z^2})$

$\angle z = a\tan 2(\Delta z, \sqrt{\Delta x^2 + \Delta y^2})$

Answer 1

Angle between solids has no meaning. We can have an intersection angle between two planes.