Answer:
Explanation:
We know that the formula for finding the area of a rectangle is A=L*W.
Keeping that in mind, we can plug in what was given to us:
99 cm^2= 11 cm * W
To find the width, you just need to divide 11 cm on both sides, which should give you W=9 cm
Now just add: 9cm+ 9cm+ 11cm+11cm
and you should get 40 cm as the perimeter.
