Measure length of the room, measure the width of the room L x W = Area of the room
That is very, very, very small for a building. It's even a small for a room. It's about the size of a 12ft by 12ft room.
95 square feet.
The building contains 4,000 square feet.
400 square feet.
If it's a square room then the room size is 14 feet by 14 feet
225 square feet
A room that is 12 feet by 13 feet is 156 square feet in area
a building with a total floorspace of 1,200 square feet. For instance, a building that is 40 feet wide and 30 feet long would have 1200 square feet of floor space.
The room is 226 square feet.
16' x 15' = 240 square feet.
A simple rectangular room 20 feet by 18 feet has 360 square feet.
164.25 square feet.