document.write( "Question 243646: In an isoscele triangle, the length of one of the equal sides is three times the length of the third side. the perimeter is 21m. find the length of each side. \n" ); document.write( "
Algebra.Com's Answer #178490 by checkley77(12844)\"\" \"About 
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2*3X+X=21
\n" ); document.write( "6X=X=21
\n" ); document.write( "7X=21
\n" ); document.write( "X=21/7
\n" ); document.write( "X=3 LENGTH OF THE THIRD SIDE.
\n" ); document.write( "3*3=9 ANS. LENGTH OF THE EQUAL SIDES.
\n" ); document.write( "PROOF:
\n" ); document.write( "2*9+3=21
\n" ); document.write( "18+3=21
\n" ); document.write( "21=21\r
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