When the length and width of the room are equal to 40 feet. In this way, you will have 40 x 40 equal 1,600 square feet.
1,000 square feet (40 x 25 = 1,000).
560 square feet (40 x 14 = 560)
400 square feet.
525 square feet.
120 square feet.
252 square feet.
324 square feet.
140 square feet.
352 square feet.
130 square feet.
770 square feet.
240 square feet
300 square feet.
162 square feet.