Find the length of all sides then add together.
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Perimeter is the outside length of an object...three-d or not. So, if you want to find out the outisde length of an object/perimeter, you will have to know the measure of one or two sides (depends on a shape) and add it.
If you know the perimeter, there is no need to find it again.
You determine the perimeter of an object by adding up the lengths of all sides.
Add all the sides up
The perimeter