document.write( "Question 930234: the altitude of an equilateral triangle is 4.2 meters long find the perimeter of the triangle \n" ); document.write( "
Algebra.Com's Answer #564797 by TimothyLamb(4379)\"\" \"About 
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s = sqrt( 4.2*4.2 + (s/2)(s/2) )
\n" ); document.write( "s = sqrt( 4.2*4.2 + (ss/4) )
\n" ); document.write( "ss = 4.2*4.2 + (ss/4)
\n" ); document.write( "ss - (ss/4) = 4.2*4.2
\n" ); document.write( "(4ss/4) - (ss/4) = 4.2*4.2
\n" ); document.write( "(3ss/4) = 4.2*4.2
\n" ); document.write( "(3/4)ss = 4.2*4.2
\n" ); document.write( "ss = 4.2*4.2*(4/3)
\n" ); document.write( "s = sqrt( 4.2*4.2*(4/3) )
\n" ); document.write( "s = 2*4.2 * sqrt( 1/3 )
\n" ); document.write( "s = 4.84974226119
\n" ); document.write( "---
\n" ); document.write( "check:
\n" ); document.write( "sqrt( (4.84974226119/2)*(4.84974226119/2) + 4.2*4.2 ) = 4.84974226119
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "perimeter = 3 * 4.84974226119
\n" ); document.write( "perimeter = 14.5492267836 meters
\n" ); document.write( "---
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