document.write( "Question 777534: The problem is: The perimeter of a triangle is 84cm. Two sides are three times the length of the third side. What are the lengths of the three sides? \r
\n" ); document.write( "\n" ); document.write( "I cannot figure out what formula to use to solve it.
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Algebra.Com's Answer #474139 by rothauserc(4718)\"\" \"About 
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let x be the length of the third side
\n" ); document.write( "3x +3x +x = 84
\n" ); document.write( "7x = 84
\n" ); document.write( " x = 12, and
\n" ); document.write( "the three sides are 36 cm, 36 cm, 12 cm
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