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In parallelogram \(ABCD\), points \(P\) and \(Q\) are taken on sides \(AB\) and \(CD\), respectively such that \(BP = DQ\). Prove that the lines \(BD\) and \(PQ\) bisect each other.
 
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Proof:
 
In \(△ BMP\) and \(△ DMQ\)
 
\(∠MBP = ∠MDQ\) []
 
\(∠BMP = ∠DMQ\) []
 
Therefore, \(△BMP≅△DMQ\) []
 
Hence, \(BM = DM\) and \(PM = MQ\) []
 
Thus, \(BD\) and \(PQ\) bisect each other.

Hence, proved.