SOLUTION: The length of a rectangle is 4 cm longer than the width. If the perimeter of the rectangle is 20 centimeters, what is the area of the rectangle?

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Question 774676: The length of a rectangle is 4 cm longer than the width. If the perimeter of the rectangle is 20 centimeters, what is the area of the rectangle?
Answer by dkppathak(439) About Me  (Show Source):
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The length of a rectangle is 4 cm longer than the width. If the perimeter of the rectangle is 20 centimeters, what is the area of the rectangle?
let width is x cm
and lenghh is x+4 cm
p= 2(l+b)
20=2(x+4+x)
20=2(2x+4)
20=4x+8
4x=20-8
4x=12
x=12/4
x=3
length =7cm and width is 3cm
area=lxb
3x7 =21 cm^2
answer AREA =21 squere cm