361 sq. feet
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21*19 = 399 square feet.
304 square feet
2587.5 square feet
19ft = 5.7912m 9ft = 2.7432m Therefore 19ft x 9 ft = 5.7912m x 2.7432m = 15.886m^2
261.25 square feet on the floor. 261.25 square feet on the ceiling. (65.5 x height of the room) square feet on the four walls.