You figure out the length of all the sides and add 'em together. P=l x 2 + w x 2
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The 'perimeter' of any closed figure drawn on paper means the total distance around it. If the figure consists of straight lines, then the perimeter is the sum of the lengths of all the straight-line pieces. If you set an ant down at a certain point on the figure and he started walking along the line, the perimeter is the distance he would have to walk in order to wind up at the point where he started.
If the figure is 2-dimensional, it is called the perimeter.
Add all sides together to get the perimeter.
the perimeter of a figure is never squared, but the area of a figure is always squared. Hope this helped :)
Perimeter and area are not sufficient to determine the shape of a figure.