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OpenStudy (anonymous):
dn
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OpenStudy (anonymous):
are you sure you didn't leave anything out? a·b = |a| |b| cos(θ) we need to know what a·b is
OpenStudy (anonymous):
yep i didn't leave anything
OpenStudy (anonymous):
I don't think it can be solved. a·b is a number, and it can not be found using the fact that a + b + c = 0, because these are just vectors.
OpenStudy (anonymous):
you are wrong,it can be solved.
OpenStudy (anonymous):
ok, let me know when you found the answer
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OpenStudy (primeralph):
Think of it as a triangle. Using the cosine rule:
OpenStudy (primeralph):
|dw:1387576228288:dw|
OpenStudy (anonymous):
ah I see now
OpenStudy (primeralph):
|dw:1387576361295:dw|
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