Posted by Bob on .
Let θ be the angle between two vectors v and u . If v*u =12, v=2, u=6√2 and 0∘<θ<180∘, what is the value of θ (in degrees)?

Math (GeometryVectors) 
Steve,
v•u = v u cosθ, so
cosθ = 12/(2*6√2) = 1/√2
clear now?