For area measurements, you multiply the length by the width. Here the calculation gives you an answer of 216 square feet.
280 sq feet
20 ft x 20 ft = 400 square ft
221 square feet
187 square feet.
156 square feet.
A 48ft by 10ft room is 480 square feet
1000 square feet
300 square feet
600 square feet.
15 feet by 10 feet is 150 square feet.
12 ft * 5 ft = 60 ft^2
And 23 ft x 23 ft room is 529 sq ft.
Assuming the room is 18 FEET by 14 FEET, the answer is 252 sq ft
25 square feet
207 square feet.
280 sq feet
264 ft 264 sq ft