To find the area of a room, multiply the length times the width.
20 X 20 equals 400 sq ft.
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The only answer is the trivial answer: 22.5 square feet. The area does not determine thye dimensions of the room. 22.5 square feet could be a room that is circular with a radius of approx 2.68 feet or it could be a room that is 1 mile lonf and only 0.0043 feet = 0.051 inches wide. It could be narrower still!
400 square feet.
16' x 15' = 240 square feet.
200 square feet.