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The length of a rectangle is twice its width. If its perimeter is 54 cm; find its length.

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The length of a rectangle is twice its width. If its perimeter is 54 cm; find its length.

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Let width of the rectangle = x cm 

Length of the rectangle = 2x cm 

Perimeter of the rectangle = 2 [Length + Width] = 2 [2x + x] = 2 x 3x = 6x cm 

Given perimeter = 54 cm 

6x = 54 

=> x = 9 

Length = 2x = 2 x 9 = 18 cm

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