21 x 11 = 231
-- There are 231 square feet on the floor.
-- There are 231 square feet on the ceiling.
-- There are a lot more square feet on the walls, but in order to
calculate them, you need to know the height of the room.
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165 square feet
288 square feet.
There are 270 square feet in a 15'x18' room.
16*16 = 256 square feet
2,500 square feet.