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# precalculus

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.

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1. 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.

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2. 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 ?

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oobleck
3. C. The vectors are not orthogonal. The angle between the two vectors is 101.3 degrees

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