Asked by T

Given vectors u=(-6,4) and v=(3,3), determine if the vectors are orthogonal. if they are not orthogonal, find the angle between the two vectors.
Answered by T
These are the choices:

a) The vectors are orthogonal
b) The vectors are not orthogonal. The angle between the two vectors is 72.5°
c) The vectors are not orthogonal. The angle between the two vectors is 101.3°
d) The vectors are not orthogonal. The angle between the two vectors is 130.6°

I feel like it might be a just because the angle I got between the two isn't an option.
Answered by oobleck
u•v = |u| |v| cosθ
if u⊥v then u•v = 0
(-6,4)•(3,3) = -18+12 ≠ 0
so what angle θ has cosθ = -6/√936 ?
Answered by Sunwoo
C. The vectors are not orthogonal. The angle between the two vectors is 101.3 degrees
Answered by Unkown
sunwoo is correct
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