84 feet... 2 x (18+24)
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To find the perimeter of a rectangle, you add up all the sides. In this case, the room is 24 feet long and 15 feet wide. So, the perimeter would be 24 + 24 + 15 + 15 = 78 feet.
24 + 36 + 24 + 36 is 120 (all in feet)
Area = 8*24 =192 square feet Perimeter = 24+24+8+8 = 64 feet
2 walls are 18 x 9 and 2 walls are 24 x 9 so not counting doors and windows it is 2x18x9 + 2x24x9 = 756 sq ft
24*4=100. So, the perimeter is 100 feet. Or, P=100 ft