document.write( "Question 971793: The adjacent sides of a parallelogram are 21 cm and 13 cm .if one of the diagonal is 2√105 cm long .find the length of the other diagonal
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Algebra.Com's Answer #594298 by Boreal(15235)\"\" \"About 
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x^2 + ((2sqrt(105)^2)=2 (21^2 + 13^2) 2 * (square of one side+ square of adj side)=2 (square of each diagonal added)\r
\n" ); document.write( "\n" ); document.write( "x^2 + 4(105) = 2 *(441 +169)\r
\n" ); document.write( "\n" ); document.write( "x^2 +420 =1220\r
\n" ); document.write( "\n" ); document.write( "x^2=800
\n" ); document.write( "x=20 sqrt (2)\r
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