18 square feet is an area, and half of 18 = 9 is a number.
You can't compare numbers with areas (or any measurement with units).
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18 m2 = 193.75 square feet.
18 square feet = 1.67 square meters.
18 square feet is about 1.7 (1.67225) square meters.
There are: 18*15.5 = 279 square feet
2.25 square feet.