If the floor is a rectangle, then the floor is (16 x 8.5) = 136 square feet, and the ceiling is also 136 square feet.
In order to find the area of the walls, we also need to know the height of the ceiling above the floor.
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One square inch is 1/144 of a square foot.1 square inch = 0.006944 square foot (rounded)1 square foot = 144 square inches
1 square foot = 144 square inches.
144 square inches is one square foot
A square foot is a unit of area. An inch is a unit of distance. The two units are therefore incompatible.
144 square inches make one square foot Each square inch is 0.006944 of one square foot. (rounded)