18 square feet

Explanation

To find area, multiply length times width (A = lw). To determine the length, subtract two times the width from the perimeter: 22 - 2(9) = 22 - 18 = 4. Then divide the remainder by 2 to determine the length of one side: 4 / 2 = 2. Then multiply length times width to determine the area: 2 feet * 9 feet = 18 square feet.

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