It's as simple as adding up all the lengths of each side.
No matter how complex the shape may be once you memorize how to do perimeter, it becomes second nature.
For complicated shapes with many sides, it requires counting how many sides there are then multiplying that by how long each side is in order to find how far around it goes.
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For example, to calculate the perimeter of a rectangle, you would add up the length of each side to get the total distance around.
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