2*(length + width) = 54 feet.
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12ft x 15ft = 180ft2
The perimeter of a rectangle is calculated by adding the lengths of all four sides. In this case, the room is 12 feet long and 10 feet wide. To find the perimeter, you add the length of all sides: 12 + 12 + 10 + 10 = 44 feet. Therefore, the perimeter of the room is 44 feet.
I would assume it to be 42 ft depending if you are talking about the inside of the room or the outside perimeter
A 20 x 20 room will have a perimeter of 20 + 20 + 20 + 20 = 80.
Perimeter = 38 feet Area = 90 square feet