document.write( "Question 891059: The length of a triangle is 3cm longer than its width. If the perimeter of the rectangle is 30cm, find its area. \n" ); document.write( "
Algebra.Com's Answer #539488 by JulietG(1812)\"\" \"About 
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The perimeter is a fence around. P = 2L + 2W
\n" ); document.write( "You're asking first about a triangle and then about a rectangle. Let's solve for a rectangle, and you can repost if you need a different angle.
\n" ); document.write( "L = W + 3
\n" ); document.write( "Substitute the value of L into the first equation
\n" ); document.write( "P = 2L + 2W
\n" ); document.write( "30 = 2(W+3) + 2W
\n" ); document.write( "Distribute
\n" ); document.write( "30 = 2W+6 + 2W
\n" ); document.write( "30 = 4W + 6
\n" ); document.write( "Subtract 6 from each side
\n" ); document.write( "24 = 4W
\n" ); document.write( "Divide each side by 4
\n" ); document.write( "6 = W
\n" ); document.write( "If the width is 6, then the length is 9
\n" ); document.write( "Perimeter = 2(9) + 2(6)
\n" ); document.write( "30 = 18 + 12
\n" ); document.write( "30=30
\n" ); document.write( "Success!
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