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I got 28 by a longer method - eventually finding the height and then the other diagonal. Actually the formula got derived. Good to know the formula though. Thanks gayathri.

OA is 28
Nice gayathri. I just wanted to bring up this formula as it could be useful. You just never know, the GMAT is full of surprises.
_________________

a parallelogram has 2 sides:14, 18 one of the diagonals is 16, what is the length of the othe diagonal?

it is useful concept to all. therefore, i thought it is useful to bring it into the discussion.

Sum of the square of Diagnals of parallogram = D1^2 + D2^2 = 2 (a^2 + b^2), Where D1 and D2 are the two diagonals and a and b are the two different sides of the parallogram.

Last edited by MA on 01 May 2005, 17:57, edited 3 times in total.