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?

Guest Jul 2, 2020

#1**0 **

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.

AnExtremelyLongName Jul 2, 2020