11 by 9 = 99 square feet and there are 0.09290304 square metres in one square foot. With this information you can now work out the answer.
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square feet x 0.092 = square meters
20 x 10 = 200 square meters.
Hectare x 10,000 = square meters
9 square meters
To convert square feet to square meters, you need to know that 1 square foot is equal to 0.092903 square meters. Therefore, to convert 12ft x 12ft to square meters, you would multiply 12ft by 12ft to get 144 square feet. Then, you would multiply 144 square feet by 0.092903 to get approximately 13.378 square meters.