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Math Help - Geometry help

  1. #1
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    Geometry help

    Can someone please help me answer this? Can you upload the solutions to this past exam paper question please. I believe AB would essentially be u-w. So that is where i've started but still a bit puzzled here so solutions would be appreciated.

    Thank you
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  2. #2
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    Re: Geometry help

    \mathbf{w}=\mathbf{u}+\vec{AB} \text { and } \vec{AB}.\mathbf{u}=0 so what is \mathbf{w.u}?

    I don't mind how many sites you post on

    Geometry help - The Student Room

    but it would avoid me wasting my time if you listed them.
    Last edited by a tutor; March 2nd 2013 at 10:39 PM.
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  3. #3
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    Re: Geometry help

    Quote Originally Posted by a tutor View Post
    \mathbf{w}=\mathbf{u}+\vec{AB} \text { and } \vec{AB}.\mathbf{u}=0 so what is \mathbf{w.u}?

    I don't mind how many sites you post on

    Geometry help - The Student Room

    but it would avoid me wasting my time if you listed them.
    I did not know you would be on all sites. It was just to get lots of different insights from other people and because not everyone replies back on one forum so that's why I choose to post on a few.

    Math Forum Discussions <--- no one has answered here

    ok so with part a) i just need to do the dot product then? I don't quite get how I'm to do the dot product on that :/
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  4. #4
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    Re: Geometry help

    OK. Now you know. Don't mind me. Bear in mind though that plenty of people help out on several forums.

    \mathbf{w.u}=(\mathbf{u}+\vec{AB}).\mathbf{u}
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  5. #5
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    Re: Geometry help

    Quote Originally Posted by a tutor View Post
    OK. Now you know. Don't mind me. Bear in mind though that plenty of people help out on several forums.

    \mathbf{w.u}=(\mathbf{u}+\vec{AB}).\mathbf{u}
    Oh my god yes duh!!! God, I'm so silly. I'm so used to a levels where we were usually doing the dot product with numbers because the vectors would be specified. Just a bit of algebra and that's the dot product.
    So once I have the dot product of w&u, do i need to find the dot product of w&v from BC?
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