To calculate the square footage of a room, you multiply the length by the width. In this case, the room is 10 feet by 15 feet, so the square footage would be 10 x 15 = 150 square feet.
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The floor and the ceiling each have an area of 150 square feet.
We can't calculate the area of the walls without knowing the
height of the room.
10 feet x 12 feet = 120 square feet
Multiply the 10 times the 9, 90 square feet
12 x 12 = 144 144 square feet
Floor and ceiling . . . (10' x 10') = 100 square feet eachFour walls . . . . . . . . (10' x 8') = 80 square feet eachTotal area inside the room = 2 (100) + 4 (80) = 520 square feet
15 feet by 10 feet is 150 square feet.