13 x 18 = 234 square feet.
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13' 4".
234 (square feet) = 21.74 square meters.
You cannot convert '18 x 13' to square feet, because you have NOT hiven the units of '18' nor '13' .
21.73931 sq m
Since the units used for 13 and 18 are not given, it is not possible to give an answer.