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A parallelogram has 2 sides as14, 18 one of the diagonals is

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A parallelogram has 2 sides as14, 18 one of the diagonals is [#permalink] New post 28 Feb 2004, 08:26
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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 [#permalink] New post 28 Feb 2004, 17:38
(d1^2 + d2^2) = 2(l1^2 + l2^2)

Substitute d1 = 16, l1 = 18, l2 = 14

d2 = 28 (answer)
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 [#permalink] New post 29 Feb 2004, 13:02
Hi gmatblast

Thanks for the formula. I derived it after you posted it. It is indeed very helpful.

Anand.
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 [#permalink] New post 29 Feb 2004, 13:16
Anandk, could you post the derivation, if it's not a problem, thanks....!!
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 [#permalink] New post 29 Feb 2004, 13:35
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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 [#permalink] New post 29 Feb 2004, 14:57
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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 [#permalink] New post 29 Feb 2004, 15:23
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 :wink:
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  [#permalink] 29 Feb 2004, 15:23
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A parallelogram has 2 sides as14, 18 one of the diagonals is

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