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I'm very confused because I don't know how I can prove that the sum of the medians of a triangle is equal to the vector zero. Can someone give me a tip or something? Thanks! (And sorry if this question is too easy for you, guys.)

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    $\begingroup$ No one cares if it's to easy, unless you're asking on math overflow. $\endgroup$ – Billy Rubina Apr 25 '13 at 21:52
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Say that the triangle is $ABC$. The vector giving the median from $A$ to $BC$ is $(AC+AB)/2$. Similarly, the one from $B$ to $AC$ is $(BA+BC)/2$, and the one from $C$ to $BA$ is $(CB+CA)/2$. Adding these, we get zero since $CB=-BC$, etc.

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