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# Vectors & Parallelograms watch

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

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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