Inquire Angle 2 Vector (3D/2D)

Inquire
Angle
Use this command to inquire the included angle between any
two vectors. The Variable option can be used to assign the queried
angle to a variable and log the variable to the active part's history.
This contributes to the "family-of-parts" functionality by allowing
the part to be driven during a history regen by variables derived from
queried distances and angles.
1st vector
Select the first vector or edge.
2nd vector
Select the second vector. The included angle is displayed in the Angle field.
Variable
You can use this option to log a variable to the active part's history whose value equals the inquired angle. The variable can then be used in any expression, equation or VX macro.