Any size room where the length in feet times the width in feet equals 400. One example would be a 20' x 20' room.
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400 square feet.
There are 44.44 square yards in a room that is 20 feet x 20 feet (400 square feet). 20 feet x 20 feet = 400 square feet 400 square feet x 0.111111111 square yards/1 square foot = 44.44 square yards 1 square foot = 0.111111111 square yards
A room measuring 20' x 20' = 400 square feet
That would be 400 square feet. A square yard is 9 square feet. Divide 400 by 9 and you get 44.4 Square yards.
About 44 1/2 square yards. (20' x 20' = 400 square feet = 400/9 square yards = 44.44444 square yards)