(length) (times) (width) (times) (two)
l x w x 2 = THE TOTAL PERIMETER OF THE SHAPE
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You find the perimeter of a triangle by adding all the sides. There is no special rule for finding the perimeter.
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.
2(b+h)
perimeter.
fixed perimeter is the perimeter being fixed