You have to break the figure into smaller parts.Then add all the sides together.
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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.
It means you have found the distance around that figure.
Add the areas of all shapes or all faces that make up the composite figure.
To find the perimeter of two-dimensional shapes, add the lengths of all the sides together. The sum is the perimeter of the figure.
The distance round a closed figure is the perimeter.