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  1. D

    Showing vector is perpendicular to the plane

    Sorry for this post found out how to solve it.
  2. D

    Last vector problem help please!

    you have vector A and vector B subtract them and whatever you get lets call it D, so you will have D+3C=0=>-D/3=C. Remember keep D in x and y component and then divide it by 3.
  3. D

    Showing vector is perpendicular to the plane

    if A, B, C are vectors from origin to the points A, B, C show that the following is perpendicular to the plane ABC: (AxB) + (BxC) + (CxA) I am having trouble setting up the problem. I cant understand the vector A, B, C. is vector A = Ai + Aj + Ak? and so on?
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