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In the triangle ABC points M, N, P belong to the sides AB, BC, CA respectively and the quadrangle CPMN is a parallelogram. If AN∩MP= R, BP∩MN =S and AN∩BP =Q, prove that $A_{MRQS} = A_{NQP}$.

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It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.