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November 01, 2025, 08:08:40 pm
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Author Topic: angle between vectors  (Read 714 times)  Share 

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ayu

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angle between vectors
« on: October 23, 2009, 02:05:54 pm »
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when finding the angle between vectors, its between two vectors that are "tail to tail" right??? i came across an exam question that just did head to tail. so my answer is completely different. Which one is it?
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thisongaintgottaname

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Re: angle between vectors
« Reply #1 on: October 23, 2009, 02:08:12 pm »
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"tail to tail"

maybe you need to extend the head to tell vector to make them tail to tail. or simply substract the answer you got from 180
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ayu

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Re: angle between vectors
« Reply #2 on: October 23, 2009, 02:26:27 pm »
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right. the question was a perpendicular question, asking to find an unknown value (ie: M). since its perpendicular, either tail to tail, or as u said, extend the head, will both result in 90degrees either way. but the actual vectors will be different, hence getting me the incorrect M value.

(this was qu.1iii, in vcaa 2002, exam2)
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TrueTears

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Re: angle between vectors
« Reply #3 on: October 23, 2009, 02:47:25 pm »
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If its perpendicular, head to tail or tail to tail shouldn't matter.
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PhD @ MIT (Economics).

Interested in asset pricing, econometrics, and social choice theory.

ayu

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Re: angle between vectors
« Reply #4 on: October 23, 2009, 03:14:00 pm »
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oo. i got it. i made a little error.again.
thnx anyway.
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