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-   -   Vectors (https://www.askmehelpdesk.com/showthread.php?t=568413)

  • Apr 6, 2011, 10:13 AM
    ApoorvGoel
    VECTORS
    If the position vectors (-jcap-kcap), (4icap+5jcap+lambdakcap), (3icap+9jcap+4kcap) and (-4icap+4jcap+4kcap)are coplanar, than the value of lambda is
    1. -1
    2. 0
    3. 1
    4. 2

    please give your choice with explanation
    please specify that what is the condition of coplanar...
  • Apr 7, 2011, 05:39 AM
    galactus









    Cross Product:



    Dot product of ACxAD and AB



    The dot product is 0 if they are coplanar.

  • Apr 7, 2011, 09:37 AM
    ApoorvGoel
    Comment on galactus's post
    Thanks a lot for your answer

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