Perimeter = sum of the sides
An octogan has 8 sides
P = 32 cm x 8 Sides
P = 256 cm
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If it's a regular octagon, the perimeter is 8 times the length of one side.
It depends how big it is. But the rule is: Side length x 8 = Perimeter. For example, if one side was eleven centimeters long then the perimeter would be P= 11 x 8. It would be eighty-eight centimeters. Note: This rule only works for regular octagons. If you need to find the perimeter of an irregular octagon, then you have to measure each side and add up the measurements of each side.
The perimeter is 72.
8 sides on an octagon. 1 cmis equal to10mm. Therefor, 10 x 8= 80 mm
112 inches, that is if all the sides are the same length .I think.