rashmi Posted September 28, 2004 Share Posted September 28, 2004 can someone tell how to calculate length of diagonal of a parallelogram. I know it will be damn simple but sleep deprivation is getting the better of my coherent thinking.Anyway... Quote Link to comment Share on other sites More sharing options...
tans Posted September 28, 2004 Share Posted September 28, 2004 hey, first u will have to know the angle its one slant side is making with horizontal. and the length of two sides, then calculate the length of two diagonals using pithagoras Quote Link to comment Share on other sites More sharing options...
rashmi Posted September 28, 2004 Author Share Posted September 28, 2004 thanks tans ,but please help with this example. My mind just seems stuck. Quote Link to comment Share on other sites More sharing options...
spiderman Posted September 28, 2004 Share Posted September 28, 2004 draw a perpendicular from A onto BC to intersect BC at E. AB = DC = sqrt(2^2 + 4^2) AE = DF = 4. =>BE = CF = 2. => EC = 12-2 = 10 consider right angled tirnagle ACE.AC = sqrt(10^2+4^2) = sqrt(116) Quote Link to comment Share on other sites More sharing options...
tans Posted September 29, 2004 Share Posted September 29, 2004 yaa, i agree with spiderman, diagonal=sqrt ((12-2)sqr+4sqr)) Quote Link to comment Share on other sites More sharing options...
rashmi Posted September 29, 2004 Author Share Posted September 29, 2004 thanks, in fact it did strike me after i posted the question. Quote Link to comment Share on other sites More sharing options...
ihateyou123 Posted December 29, 2012 Share Posted December 29, 2012 Where's the F and E in the attached picture? Your formula gives the correct answer but I'm still confused on how you got to it. Quote Link to comment Share on other sites More sharing options...
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