Assuming that the longer dimension is called the length, and the other the width, it can have any length greater than or equal to 10 metres.
It could, for example be a room that is 100 m long and 1 metre wide.
Or 1 kilometre long and 10 centimetres wide.
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You have to measure the area of the room. Measure both length and width in meters and multiply both to get the area in square meters.
There are approximately 0.3048 meters per foot, or 0.0929 square meters per square foot. A rectangular room 16 by 9 feet has an area of 144 square feet or 0.0929(144) = 14 square meters, to the justified number of significant digits.
The area is: 4 times 3.2 = 12.8 square meters
It would be a very small room. More like a closet. Try 1 meter by 3 meter, or 1.5 meter by 2 meter both would make 3 square meters.
(13m x 17m) x (27.80/m^2) = 6,143.80