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 November 4th, 2010, 04:18 AM #1 Member   Joined: Aug 2010 Posts: 32 Thanks: 0 A parallelogram A palrallelogram has the length of diagonals d1, d2 . Another parallelogram with sides of lengths l1 and l2 inscribed in the first such that its sides are parallel to the diagonals of the first one . Prove : $\frac{l_1}{d_1} + \frac{l_2}{d_2}=1$

### Palrallelogram

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