It is: 20 times 20 = 400 square feet
800 square feet (40 x 20 = 800).
600 square feet
If the numbers are in feet then 86 times 20 = 1720 square feet
200 square feet
360.
20
A 20' x 18' ceiling comprises 33.45 (33.4450944) square meters.
A simple rectangular room 20 feet by 18 feet has 360 square feet.
18 ft X 20 ft = 360 Square feet
18*20 = 360 square feet
The answer is 33.55 sqm
18 feet is 5.4864 meters (says google, just type "18 feet in meters") 20 feet is 6.09600 meters 5.4864 * 6.09600 = 33.4450944 meters squared (AKA square meters).
20 x 20 = 400 square feet.
400 square feet.
Do you mean a real square with the side length of 20 feet? Then 20 feet times 20 feet is 400 square feet.
400 square feet