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.
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If it is 8 feet by 5 feet then there are 8*5 = 40 square feet
5 square yards is 45 square feet.
40 square feet.
5 x 10 = 50 square feet
45 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.