If you want to overlap the ends a bit you need a rectangular tablecloth about 102 - 108 inch long
Area = length times width So area = 12(18) = 216 sq. feet
You would find the area by multiplying the width by the length, so the area would be 216 square feet.
If it's rectangular, just multiply the length times the width.
216 feet squared
72 square feet
We can't definitively state the measurements. A strip of land 2 feet wide and 225 feet long would have that area. So would a rectangular patch 25 x 18.
You can't convert feet into square feet; they are two entirely different and incompatible units. Converting feet to square feet is like converting apples to oranges. A linear foot is a unit of distance. A square foot is a unit of area. If you have a rectangular surface, you can compute the area in square feet by multiplying the length in feet by the width in feet. For example, a rectangular patio that is 12 feet wide by 15 feet long has an area of 12 x 15 = 180 square feet.
If it's rectangular, then the area of the water's surface is (9' x 18') = 162 square feet. The bottom of the pool has a different area if it's slanted.
Making the assumption that the room is rectangular (as most are) then this question is the same as "what is the area of a rectangle 16x9 feet?" To find the area of a rectangle you multiply its length by its width, so we do: 16x9 =144 square feet or 16 square yards.
It is: 8*3*5 = 120 cubic feet