Well you would do 3 + 3+3+3 witch = 12 so 12 is the answer
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Each side would be 3 inches long and there are 4 sides, so 12 inches.
Area = 9 sq inches Length of side = sqrt(9) = 3 inches Perimeter = 4*Length of side = 4*3 = 12 inches
4 inches x 3 sides = 12 inches for the perimeter.
3 inches (6 sides x 0.5 = 3).
A regular octagon has 8 sides so if each side is 3 1/2 inches long then the perimeter is just 8*(3 1/2 inches) or 28 inches