Add up all of the lengths of the edges adjacent to one of the bases.
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Perimeter = 2 x (length+width). You add the length to the width and multiply the sum by two.
It isn't clear how you would define the "perimeter" for a 3D figure. The base is the product of length x width.
surface area=(perimeter of base)x(height of the shape)+(area of the base)x(2)
divide perimeter by 6.
4