document.write( "Question 226267: the base of an isosceles triangle is one-third the length of each of the congruent sides. The perimeter of the triangle is 84 cm. How long is the base? \n" ); document.write( "
Algebra.Com's Answer #168564 by scott8148(6628)\"\" \"About 
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if the base is X, then each of the congruent sides is 3X and the perimeter is 7X\r
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\n" ); document.write( "\n" ); document.write( "7X = 84 ___ X = 12
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