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Thread: Geometry...

  1. #1
    I dont understand how to do this crap! and i dont understand the book. Can someone please explain how do do this.

    Y is the midpoint of XZ. For each pair of points given, find the coordinate of the third point.
    X(5,5), Z(-1,5)

    Can anyone please explain how to do this?
    Any help will be appreciated

  2. Lounge   -   #2
    4play's Avatar knob jockey
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    im guessing it is y(2,5)

  3. Lounge   -   #3
    How did u get to that answerd . Please explain how so i can do the rest. Thanks

  4. Lounge   -   #4
    4play's Avatar knob jockey
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    it is the differnce between the two x or y number divided by 2 and then subtract this number off the largest so :

    5 + (-1) = 6 note: the -1 gets counted as a positive

    6/2 = 3 divided by 2

    5 - 3 = 2 that is the midpoint of the two x numbers.

    hope that helped that probably aint the best way to do it but hey it works for me.

  5. Lounge   -   #5
    man o man. this takes me back years.

  6. Lounge   -   #6
    4play's Avatar knob jockey
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    man o man. this takes me back years.
    same here but i still looked at it an though erm how do i do this again since it has been that long.

  7. Lounge   -   #7
    ashutosh_cool16's Avatar Internet Addict
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    Its a simple formula to find out the coordinates of midpoint... Its called the midpoint formula in co-ordinate geometry.


    The formula is -

    If Y is the Midpt of X (x1,y1) and Z(x2,y2) ,

    Assume coordinates of Y to be (X,Y)



    therefore, X = x1+x2 divided by 2

    Y = y1+y2 divided by 2

    Apply this formula to ur problem.... u'll get the answer.
    [IMG]http://img272.echo.cx/img272/9836/band8sw.gif[IMG]

  8. Lounge   -   #8
    Originally posted by 4play@23 September 2003 - 09:20
    man o man. this takes me back years.
    same here but i still looked at it an though erm how do i do this again since it has been that long.
    well, i didn't wanna be the first, so i waited...

  9. Lounge   -   #9
    bigboab's Avatar Poster BT Rep: +1
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    At what point were you going to intervene Niki? Formula please.
    The best way to keep a secret:- Tell everyone not to tell anyone.

  10. Lounge   -   #10
    Illuminati's Avatar Simple Bystander BT Rep: +7BT Rep +7
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    The formula to find a midpoint of a line (in relation to the algebra you've given us) is
    Co-ordinates of Y = ([X of X + X of Z, all / by 2] , [Y of X + Z of X, all / by 2])

    So in the example you gave us
    Co-ords of Y = ([5 + -1 /2] , [5 + 5 /2]
    = ([4/2], [10/2])
    = (2, 5)
    so the co-ords of Y are (2, 5)

    Sorry if that seems a little confusing (Invision Power Boards aren't really designed for formula writing), but compare this topic with a textbook with the proper form of the equation in and you should do fine


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