Asked by Anonymous
Find cosθ between two vectors v = (-3, -4) and u = (1, -2).
(A)√5/4 (B) 3/√2 (C) √5/5 (D) 0.8
(A)√5/4 (B) 3/√2 (C) √5/5 (D) 0.8
Answers
Answered by
oobleck
u•v = (-3)(1) + (-4)(-2) = 5
also, recall that
u•v = |u| |v| cosθ
so, now you have
5*√5 cosθ = 5
cosθ = 1/√5
θ = 63.43°
also, recall that
u•v = |u| |v| cosθ
so, now you have
5*√5 cosθ = 5
cosθ = 1/√5
θ = 63.43°
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.