It depends on whether "18 x 24" refers to 18 ft x 24 ft or 18 yards x 24 yards or 18 metres x 24 metres or some other measures. Since the units for the given measurements are not known, it is impossible to answer the question.
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360 square feet.
432 square feet.
18 ft X 20 ft = 360 Square feet
The answer is 33.55 sqm
198 square feet. Just multiply length by width - the answer is the square footage.