you find square feet by multiplying length X width so a room 15' X 17' would equal 255 sq ft.
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225 square feet.
15 feet -times- 19 feet = 285 square feet.
There are 270 square feet in a 15'x18' room.
75 square feet.
Assuming you mean the room is 15 feet by 9 feet - 135 square feet.