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Senior Manager
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A parallelogram has 2 sides as14, 18 one of the diagonals is [#permalink]
 28 Feb 2004, 09:26
A parallelogram has 2 sides as14, 18 one of the diagonals is 16, what is the length of the othe diagonal? Working appreciated.Thanks!!
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Senior Manager
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(d1^2 + d2^2) = 2(l1^2 + l2^2)
Substitute d1 = 16, l1 = 18, l2 = 14
d2 = 28 (answer)
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SVP
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Hi gmatblast
Thanks for the formula. I derived it after you posted it. It is indeed very helpful.
Anand.
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Anandk, could you post the derivation, if it's not a problem, thanks....!!
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GMAT Club Legend
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Yes, nice formula Gmatblast. I learned this forumla from Stoylar and recall him giving this formula in a post long ago. You can figure out this formula actually but it is quite time consuming
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Best Regards,
Paul
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Senior Manager
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Paul wrote: Yes, nice formula Gmatblast. I learned this forumla from Stoylar and recall him giving this formula in a post long ago. You can figure out this formula actually but it is quite time consuming
Paul,
It is not that time consuming. May be 1 minute to derive the formula. Give it a shot..
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GMAT Club Legend
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gmatblast wrote: Paul wrote: Yes, nice formula Gmatblast. I learned this forumla from Stoylar and recall him giving this formula in a post long ago. You can figure out this formula actually but it is quite time consuming Paul, It is not that time consuming. May be 1 minute to derive the formula. Give it a shot.. Oh well, I thought it was because I never tried it. It wasn't after all. But it's sure nice to have it off hand 
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Best Regards,
Paul
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