Add all the sides up
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You determine the perimeter of an object by adding up the lengths of all sides.
The perimeter
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.
This has several values.The perimeter is twice the sum of any two numbers whose product is 54.
Find the length of all sides then add together.