Question 1074386
Find the angle between the vectors.
1. v=(-3,4) u=(8,5)
Dot product = |v|*|u|*cos(A)
-3*8 + 4*5 = 5*sqrt(89)*cos(A)
cos(A) = -4/(5sqrt(89)) =~ -0.08479983
Angle =~ 94.8645 degs
================

2. (-3,8), (-1,-9) this one did not come with u and v.
Same problem, different numbers.