225 square feet. This is an easy calculation - just multiply the length by the width. The answer is the number of square feet.
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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.