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)![]() ![]() You can put this solution on YOUR website! 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! \n" ); document.write( " |