Multiply by length x the width of the room. Sometimes the room is not just a rectangle. Then you must divide it up into smaller pieces each of which is a rectangle.
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sg 1.023-1.025 for live rock in aquarium
5.333 sq. yd. 6912 sg. in.
= (3 rooms X 12 ft X 12 ft) + (2 rooms X 15 ft X 20 ft) = (3 X 144 ft^2) + (2 X 300 ft^2) = (432 + 600) ft^2 = 1032 square ft OR you can write this as 1032 ft^2, which is just feet raised to the second power.
12 ft
The answer will depend on the shape of the figure! If a rectangle, then 22 ft.