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Mathematics 19 Online
OpenStudy (anonymous):

The perimeter of a rectangle is 30yd , and the area of the rectangle is 54yd^2 . Find the dimensions of the rectangle

OpenStudy (mathmate):

Perimeter = 2(length+width) =30 so length+width=15 Area = length*width = 54 We are looking for two numbers which when multiplied together give 54 and added together give 15. Can you find the two numbers?

OpenStudy (aivantettet26):

P = 30 A = 54 P = 2L + 2W A = LW

OpenStudy (aivantettet26):

|dw:1375560825880:dw|

OpenStudy (aivantettet26):

Substitute the L = 54/W to the equation of the Perimeter

OpenStudy (aivantettet26):

|dw:1375560878439:dw|

OpenStudy (aivantettet26):

|dw:1375560989550:dw|

OpenStudy (aivantettet26):

|dw:1375561160408:dw|

OpenStudy (aivantettet26):

Therefore we conclude that there are two possible dimensions W = 9 and L =12 OR W = 6 and L = 18

OpenStudy (mathmate):

A minor correction: |dw:1375561909186:dw|

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