SOLUTION: A rectangle is 4 times as long as it is wide. Its area is 84km^2.Find the dimensions to decimalplaces.

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Question 1044564: A rectangle is 4 times as long as it is wide. Its area is 84km^2.Find the dimensions to decimalplaces.

Answer by ikleyn(52787) About Me  (Show Source):
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A rectangle is 4 times as long as it is wide. Its area is 84km^2.Find the dimensions to decimalplaces.
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L = 4W   (given).


Area S = L*W = (4W)*W = 4W%5E2 = 84.

Hence,  W%5E2 = 84%2F4 = 21.

Then  W = sqrt%2821%29 = 4.583 km.

Then L = 4W = 4*4.583 = 18.303 km.

Answer.  The dimensions of the rectangle are  4.583 km  and  18.303 km.