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# C4 vectors watch

1. http://store.aqa.org.uk/qual/gce/pdf...4-QP-JAN12.PDF

Last question, part (b)

I managed to work out the coordinates of C and got (11/2,11/2,0) But I don't have clue how to work the coordinates of D.
2. You say you've already got C and they give you A and B. So OD = OA + AD

You know OA because it's given to you. AD = BC. You can work out BC = BO + OC. Add them together you should get your answer.
3. Ok I did that and got D as (15/2,7/2,4). ty

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