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Math Help - Parallelogram vectors

  1. #1
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    Parallelogram vectors

    ABCD - parallelogram:


    vector AB + vector DC = ?
    So I would want to do this:

    And say that vector AB + vector DC = vector AC, but I'm pretty sure that's wrong.

    Could someone please help? We've just started vectors.
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  2. #2
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    \overrightarrow {AB}  + \overrightarrow {DC}  = 2\overrightarrow {AB}
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  3. #3
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    Thank you! But could it also be \overrightarrow {AB} + \overrightarrow {DC} = 2\overrightarrow {DC}?
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  4. #4
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    Yes.
    \overrightarrow {AB}  = \overrightarrow {DC}
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