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(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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Q: How many square feet does a room measuring 21.5 feet 21.5 feet have?
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