Assuming the room is rectangular, multiply length x width (both in feet).
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To calculate square footage, you multiply the length by the width of the room. So, if the room measures 10 ft. by 18 ft., your total area is 180 sq. ft.
The sq ft of a room 6 ft x 9 ft is 54 ft2.
11 ft * 13 ft = 143 sq. ft, so the room has an area of 143 sq. ft
96 sq ft.
12' * 21 ft = 12*21 sq ft = 252 sq ft.