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    Hey, umm if any1 could help me out with this 1 it would b most appreciated!!! lol, thanx

    Q) A (2,-1,4) B(7,1,3) C(-6,4,2). If ABCD is a parallelogram (in attatchment file), find the co-ords of D.

    Well, i tried it & got the answer (15, -4, 5)
    Found B--->C= c - b
    = (-13,3,-1) & used that to find how far d was from A

    Nae sure if its right, so I'd be gr8ful if any1 could match this answer or tel me if its wrong/what i've done wrong. Lol, i've bet i've missed sommin easy.

    Cheers!!
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    You found AD, but the question is asking for OD.

    OD = OA + AD
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    I'm sorry, i dun know where your getting the O from =<
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    so u use the origin (0,0,0) ? lol, mayb i'll get it sommetime the day =)
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    so the answer is D(17, -5, 9) ??

    OD = OA + AD
    d-o = (a-o) + (d-a)
    d = (2i-j +4k) + (15i -4j + 5k)
    d = (17i -5j + 9k)

    Lol, is at right? =)
 
 
 
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Updated: April 12, 2006
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