document.write( "Question 918132: a square and an equilateral triangle have the same perimeter.the sum of one side of square and one side of the triangle is 21cm. find the length of one side \n" ); document.write( "
Algebra.Com's Answer #556926 by ewatrrr(24785)\"\" \"About 
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4s = 3t and t = 21-s
\n" ); document.write( "4s = 3(21-s)
\n" ); document.write( "7s = 3(21)
\n" ); document.write( "s = 9, side of square and t = 12 \"21-9\"
\n" ); document.write( "And..checking
\n" ); document.write( "P = 36 = 36
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