(21.5) x (21.5) = 462.25
-- It has 462.25 square feet on the floor.
-- It has another 462.25 square feet on the ceiling.
-- It has (21.5 times the height of the room) square feet on each of the four walls.
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A room measuring 13 feet 6 inches by 13 feet 9 inches has an area of: 182.63 square feet.
40 square feet.
To find the area (square feet) of a room, multiply the length by the width. 10 feet x 20 feet = 200 square feet.
25 square feet
99ft2