document.write( "Question 722578: Consider two rectangles, A and B. Rectangle A is four times as long as rectangle B and three times as wide. The perimeter of rectangle A is 106 cm and the perimeter of rectangle B is 30 cm.
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document.write( "What are the dimensions of the larger rectangle? \n" );
document.write( "
Algebra.Com's Answer #442812 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Consider two rectangles, A and B. Rectangle A is four times as long as rectangle B and three times as wide. \n" ); document.write( " The perimeter of rectangle A is 106 cm and the perimeter of rectangle B is 30 cm. \n" ); document.write( "What are the dimensions of the larger rectangle? \n" ); document.write( ": \n" ); document.write( "Let a = length of the small rectangle \n" ); document.write( "then \n" ); document.write( "4a = the length of the large rectangle \n" ); document.write( ": \n" ); document.write( "Let b = the width of the small rectangle \n" ); document.write( "then \n" ); document.write( "3b = the width of the large rectangle \n" ); document.write( ": \n" ); document.write( "\" The perimeter of rectangle A is 106 cm\" \n" ); document.write( "2(4a) + 2(3b) = 106 \n" ); document.write( "simplify, divide by 2 \n" ); document.write( "4a + 3b = 53 \n" ); document.write( ": \n" ); document.write( "\"the perimeter of rectangle B is 30 cm.\" \n" ); document.write( "2a + 2b = 30 \n" ); document.write( "simplify, divide by 2 \n" ); document.write( "a + b = 15 \n" ); document.write( "b = (15-a) \n" ); document.write( ": \n" ); document.write( "Replace b with (15-a) in the 1st perimeter equation \n" ); document.write( "4a + 3(15-a) = 53 \n" ); document.write( "4a + 45 - 3a \n" ); document.write( "4a - 3a = 53 - 45 \n" ); document.write( "a = 8 cm is the length of the small rectangle \n" ); document.write( "and \n" ); document.write( "b = 15-8 \n" ); document.write( "b = 7 cm is the width of the small rectangle \n" ); document.write( ": \n" ); document.write( "\"What are the dimensions of the larger rectangle? \n" ); document.write( "4(8) = 32 cm is the length \n" ); document.write( "3(7) = 21 cm is the width \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "See if the that checks out, find the perimeter with these values \n" ); document.write( "2(32) + 2(21) = \n" ); document.write( "64 + 42 = 106 \n" ); document.write( " |