the area of a rectangle that measures 18ft by 13ft is:
18 * 13 = 234 ; ft * ft = ft2
234 sq ft OR 234 ft2
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13' x 22' (286 square feet) = 26.57 square meters.
12 x 13 = 156 square feet.
13' x 13' (169 square feet) = 18.77 square yards. (divide square feet by 9 to get square yards)
A square with sides of 16 feet and 18 feet would be 288 square feet. 16 ft x 18 ft = 288 ft2
2.25 square feet.