We simply multiply the width of the floor by the length of the floor, 20 feet times 20 feet equals 400 square feet.
Secondly, what are the dimensions of a 500 sq ft room? 500 square foot room has to be defined by the type of shape. If the room is exactly square than the answer is the square root of 500. That is a room very closely to 22.36 feet square.
Also, how many square feet is a 20x20 room?
400
How many square feet is a 12x32 room?
12x32 Tiny House -- #12X32H6 -- 461 sq ft - Excellent Floor Plans.