Question: How to find angle with vectors


I am haveing one or two issues with vectors.

I am trying to calculate the Angle.

The angle is between

a = s -d -f

b = 3s + d

and then the unit vector which lies perpendicular to a and b


To figure to angle out would you use

cos(theta) = a.b / ( |a| * |b| )

Am i way off or am i close?



Please Wait...