Oh, dude, math time! So, to find the square footage of a room, you just multiply the length by the width. In this case, 21 feet by 11 feet gives you 231 square feet. That's like, the size of a pretty decent living room or a small studio apartment. Math can be fun... sometimes.
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21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
11 ft * 13 ft = 143 sq. ft, so the room has an area of 143 sq. ft
approx. 172.5 square feet
12 in = 1 ft → 11ft 8in x 11ft 3 in = 118/12 ft x 113/12 ft = 112/3 ft x 111/4 ft = 35/3 ft x 45/4 ft = 525/4 sq ft = 1311/4 sq ft = 131.25 sq ft
Length times width gives you the answer, surely you can do 11X 12 in your head or on your phone....