The length of a rectangle is four times its width.

Mathematics
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The length of a rectangle is four times its width. 
If the area of the rectangle is 
 
 , find its perimeter.
Feb 13th, 2015

Length = 4x 
Width = x 
Area = 324 
324 = (4x)(x) 
324 = 4x^2 
324/4 = x^2 
81 = x^2 


sqrt[81] = sqrt[x^2] 
9 = x 
We find the perimter using P = 2L + 2W. 
P = 2(4x) + 2(x) 
P = 2(4*9) + 2(9) 
P = 2(36) + 18 
P = 72 + 18 
P = 90 yards

Feb 13th, 2015

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