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Simple vectors question

  • Thread starter Ed Aboud
  • Start date
  • #1
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Homework Statement



Check the picture.

Homework Equations





The Attempt at a Solution



I'm sure it's very simple but I just can't seem to get it. I've been sitting here staring at the page for a while now with no joy. Check the picture for my attempt.
Thanks very much for any help, greatly appreciated.
 

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Answers and Replies

  • #2
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Can anyone help with this?
 
  • #3
rock.freak667
Homework Helper
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well you are correct in saying that [itex]\hat{b}=\frac{\vec{ab}}{|ab|}[/itex] and that [itex]\hat{c}=\frac{\vec{ac}}{|ac|}[/itex].

and if [itex]\vec{ad} = t( \hat{b} - \hat{c})[/itex] what does that tell you about the direction of that vector?

How would you find the vector bc?

then how do you get the angle between two vector lines?
 
  • #4
199
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Ah I see it now so [itex] \vec{ad} = t ( \hat{cb} ) [/itex]
Therefore [itex] \vec{ad} [/itex] is perpendicular to [itex] \hat{cb} [/itex]
Therefore [itex] \vec{ad} [/itex] is the perpendicular bisector of the the line bc.
Thank you very much for your help!
 

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