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Parallelogram proof

  1. Jan 17, 2007 #1
    Parallelogram proof :(

    1. The problem statement, all variables and given/known data
    In parallelogram ABCD, P is any point on BC. Prove that triangle APD = triangle ABP + triangle DCP

    2. Relevant equations

    3. The attempt at a solution
    I really don't know where to start :(

    any help would be greatly appreciated :)
  2. jcsd
  3. Jan 18, 2007 #2


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    Staff Emeritus
    Science Advisor

    First do you mean that the areas satisfy that equation? If so just note that the lengths of the bases of the two triangles ABP and DCP add to the length of the base of triangle APD and all three triangles have the same height.
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