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The rectangle ABCD was divided into 9 small rectangles, and some rectangles have their perimeter inside it. The perimeter of rectangle ABCD is 54 cm. What is the perimeter of the gray rectangle?

 

 Jul 2, 2020
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Hint:

Set the length of the grey rectangle to X

Set the width of the grey rectangle to Y.

 

Use simple algebra to find the other rectangle's width and length in terms of X and Y.

 

Then solve an equation.

 Jul 2, 2020

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