2*(L+W) where L is the length and W is the width of the poster
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The perimeter of a rectangular shape such as a poster is 2 x length + 2 x width. In this example the perimeter = (2 x 3) + (2 x 6) = 6 + 12 = 18 feet
It depends on a rectangular what.
Add up all of the lengths of the edges adjacent to one of the bases.
Solid objects do not have a perimeter in the geometric sense.
Twice the (width plus length)