Angle between line and plane

[pj]

It seems like Autograph calculates the angle between a line and a plane, as the angle between the line and the normal to the plane. Why ?

[Simon]

Dear pj,

Thank you for your email.  The angle is given between the normal and the line because the normal is uniquely defined and therefore the angle is completely unambiguous.  Some might argue (I don\'t!) that the angle between a line and a plane does suffer from a little ambiguity.  However, I will discuss this point with the team.

Kind regards,

Simon