The area is 99 square feet.
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9 x 11 = 99
a=b*l 9*11=A A=99 sq feet
A 12 x 11 room is 131 square feet in floor area
Area = 9 x 11 sq yards = 99 sq yards Perimeter = 2 x (9 + 11) yards = 40 yards
It is 143 square metres, except that with those dimensions I'd call it a hall!