Oh, dude, the perimeter of a rectangle is just adding up all the sides, so for a 12ft by 8ft rectangle, you just do 12 + 12 + 8 + 8, which equals 40 feet. It's like measuring the sides of a fence but with math instead of a tape measure.
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perimeter is the sum of all sides. 3+3+8+8 = 22 feet
(12ft x 12ft) square =144 sq ft. 12ft x (12 ft square) is 1728 cu ft.
There are 100 inches in 8ft 4in
What is 13ft x 8ft converted in sqm13ft x 8ft = 104ft2 which converts to 9.66m2