Hi, can someone show me how I would use vectors to prove that the diagonals of a parallelogram bisect each other? Thanks, any help would be appreciated. Cheers.
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Indication: Let M be the middle point of [AC] and N the middle point of [BD]. Try to prove that M=N. (For that a first step is writing $\displaystyle \overrightarrow{DM}$ and $\displaystyle \overrightarrow{DN}$.)
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