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Math Help - Need help with my geometry homework

  1. #1
    Junior Member
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    Need help with my geometry homework

    Okay so I got this homework right... Yeah you all know what I mean.

    But I can't make heads or tails of how to do it.
    I'm not going to post it all, just a question and I'll figure out how to do the rest of it if someone helps with this one.

    Now here is the first one. I really don't need the answer, just the formula (and/or how to do it if there is no given formula).

    Use the given endpoint R and midpoint M of RS(Has a line segment sign over it) to find the coordinates of the other endpoints.
    R(6,0), Midpoint (0,2)
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  2. #2
    Super Member Matt Westwood's Avatar
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    From the end R to the midpoint M the x co-ordinate goes from 6 to 0. So to carry on going to the other end, it has to go as far again as it's already gone, that is, from 0 to -6.

    Similarly with the y co-ordinate, it goes from 0 to 2, so it has to go as far again, that is, from 2 to 4.

    It doesn't really need a formula, just thinking in the right direction (no pun intended).
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  3. #3
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    aha, so what you're saying is if I plot it I can see where the other one should be? Right?
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  4. #4
    Super Member Matt Westwood's Avatar
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    Shouldn't need to plot it, but if it helps then nobody in the world is going to stop you ...
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