The area of a square is base times height, so if 9 and 18 is your base and height, just mutiply them.
9x18=162
And since its area, you'll have to label it 162ft (to the second power)
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There are 270 square feet in a 15'x18' room.
Simply multiply the dimensions: 12 * 18 = 216 square feet
2.25 ft2
Firstly you must decide whether the measurements you have given are in feet, yards or metres. Assuming they are in feet, then the area of the room is 216 sq. ft., or 24 sq.yd. The amount of carpet you need will depend on how wide the roll is, the exact shape of the room and how much you are willing to piece the carpet. You may also need to allow for pattern repeats if you want to match a pattern.
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