45 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
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Oh, dude, math time! So, to find the square footage of a room, you just multiply the length by the width. In this case, 9 feet times 5 feet gives you a total of 45 square feet in that room. So, like, that's your answer.
4 x 9 = 36 (square feet).
54 square feet (6 x 9 = 54).
19' x 9' = 171 square feet
With 9 square feet in a square yard.... 760 x 9 = 6840 square feet