216 square inches is 1.5 square feet.
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If you mean "what is it in square inches", it is 216 square inches.
216 inches x 18 inches = 3888 sq.inches x (1ft/12inches)2 =3888/144 =27sq.ft
216 inches is 18 feet.
There are 12 inches in one foot. Therefore, 216 inches is equal to 216 / 12 = 18 feet.
216 inches / 11 feet = 18 feet/11 feet = 18/11