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coolkat4
Group Title
Find the angle between the given vectors to the nearest tenth of a degree. u = <6, 1>, v = <7, 4>?
 one year ago
 one year ago
coolkat4 Group Title
Find the angle between the given vectors to the nearest tenth of a degree. u = <6, 1>, v = <7, 4>?
 one year ago
 one year ago

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Hoa Group TitleBest ResponseYou've already chosen the best response.0
i think it is 0+2kpi
 one year ago

coolkat4 Group TitleBest ResponseYou've already chosen the best response.0
thats no possiable as one of the given solutions..
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
theres a relationship between cos and dot products, do you recall it?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
then the angle is simple to be found knowing:\[uvcos~\alpha=u \cdot v\]
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
solve for alpha :)
 one year ago

coolkat4 Group TitleBest ResponseYou've already chosen the best response.0
i remember the formula how do i plug the numbers into the formula?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
you know how to do a dot product right? and to find lengths of vectors?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
those are the numbers you need then, what do you get for: u.v and the lengths of u and v ?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
u = <6, 1>; sqrt(37) v = <7, 4>; sqrt(65)  u.v 42+5 = 49 uv = sqrt(37*65) .... what does 38 mean?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
\[\cos~\alpha=\frac{u.v}{uv}\] \[\cos~\alpha=\frac{49}{\sqrt{37*65}}\] \[\alpha=cos^{1}\frac{49}{\sqrt{37*65}}\]
 one year ago

coolkat4 Group TitleBest ResponseYou've already chosen the best response.0
the 38 came from 42+(4)
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
lol ... i do tend to add when i need to multiply when doing that
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
1*4 is +4, and i did a +5 :)
 one year ago

coolkat4 Group TitleBest ResponseYou've already chosen the best response.0
okay thank you i got 20.28?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
i got something closer to 10
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.2
http://www.wolframalpha.com/input/?i=arccos%2848%2Fsqrt%2837*65%29%29
 one year ago
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