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contraction
To find the perimeter of a figure, add all the lengths of the edges of the figure. The sum of the sides is the perimeter.
You cannot figure out the length of an octagon without a lot more information. Alternatively, you can measure the lengths of the sides.
You add the lengths of all the sides. If one "side" is a part of a circle, find the length of it and add it to the other sides.
The only classification I could give this figure would be that it is a trapezoid, perhaps.