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posted by  SamSan on 11/30/2008 7:03:37 PM  |  status: Closed  

Help please (Earn up to 10 karma points)

Course Textbook Chapter Problem
Calculus N/A N/A N/A
Question Details:
Find the angle between the vectors :

 a =3i- 4j + 2k and b = 7i + j + k

     

 
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Oracle
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posted by roydesoto on 11/30/2008 7:08:06 PM  |  status: Live
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SamSan's comment:
"thank u"
Response Details:
a dot b = 21 - 4 + 2 =19

||a|| = √(29) and ||b|| = √(51)

so cos θ = 19/[√(29)√(51)] = 0.4940

so θ =arccos 0.4940 = 60.39o
Oracle
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posted by A-Rod 7821 on 11/30/2008 7:57:39 PM  |  status: Live
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SamSan's comment:
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Response Details:
To find the angle between two vector using the following formula:
Take the magnitude of vectors a and b.
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