I will do the first, you do the second
u•v = |u||v|cosØ, where Ø is the angle between them
cos Ø = (2 - 3)/(√5√10) = -1/√50 = -..14142
Ø = 81.87°
let me know what you get for the other one.
If you want your angle in radians, make sure your calculator is set to RAD
In each of the following, find the angle formed by u and v:
(a) u = [2, 1] and v = [1,−3]
(b) u = [−1, 0, 1] and v = [0, 2,−2]
2 answers
thanks