Perimeter = 2 x (length+width).
You add the length to the width and multiply the sum by two.
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Add up all of the lengths of the edges adjacent to one of the bases.
surface area=(perimeter of base)x(height of the shape)+(area of the base)x(2)
The base of a rectangular prism is a rectangle. The area of a rectangle is length times width.
1/2 AP where A=apothem and P= perimeter
The volume of a rectangular prism is base*height*length in cubic units