Monica's room is 20ft long, 15ft wide, and 9ft high, find the surface area of the room that you are going to paint including the floor and ceiling
The floor area is found by multiplying the length and width: 20ft x 15ft = 300ft²
The ceiling area is also 300ft².
To find the wall area, we need to find the perimeter of the room and multiply by the height. Perimeter = 2(20ft + 15ft) = 70ft. Wall area = 70ft x 9ft = 630ft².
To find the total surface area that needs to be painted, we add the floor area, ceiling area, and wall area.
Total surface area = floor area + ceiling area + wall area
Total surface area = 300ft² + 300ft² + 630ft²
Total surface area = <<300+300+630=1230>>1230ft²
Therefore, the surface area that needs to be painted, including the floor and ceiling, is 1230ft².