400 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
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15 feet x 15 feet = 225 square feet.
The floor and ceiling are each 20 square feet. In order to know the area of the walls, we would also need to know the height of the ceiling.
To find the area of a room, multiply the length times the width. 20 X 20 equals 400 sq ft.
36 square feet on the floor. 36 square feet on the ceiling. ( 6 x height of the room) on each wall. Total area inside the room is [ 24 times (3 + height of the room) ] square feet.