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    • Thread Starter

    Hey =) All i can say on this question is help! lol. If any1 could help me on this, it would b much appreciated!

    Q4) The sides of this equilateral triangle (in attatchment) are 2 units long & represent the vectors a,b, & c.

    Evaluate a. (a + b +c)

    I guess ya need to find the components of these vectors, but I just dont know how...maybe I'm missing sommin important here that one of you guys might notice.

    Thanx xx
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    Since a + c = b,

    a.(a + b + c)
    = a.(2b)
    = 2 a.b

    Now use a formula for the dot product.
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Updated: April 13, 2006
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