Area and Perimeter of a Rectangle

The length of a rectangle with area 54 square centimeters is 9 centimeters.  What is the perimeter of the rectangle
A.)  6
B.)  12
C.)  15
D,)  24
​E.)  30

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Area of a rectangle = length x width

If the area is 54 and the length is 9, then the width would be 6.

A = length x width
54 = 9w   {substituted area, width, and length into area formula}
w = 6   {divided each side by 9}

The perimeter of a rectangle = 2(width) + 2(length)

P = 2(width) + 2(length)
P = 2(6) + 2(9)   {substituted width and length into perimeter formula}
= 12 + 18   {multiplied}
= 30   {added}

Perimeter is 30 centimeters

E.)  30

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