You take the human in question and have him or her lie down on a bed, then you take a fairly long piece of string or twine and lay it next to that person as closely as you can, all along his or her perimeter, then snip it off so that it is the length of that perimeter. Then, you can straighten out the piece of string and measure it with a ruler or tape measure.
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If you know the perimeter, there is no need to find it again.
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
There are many formulas for perimeter depending on what shape you are trying to find the perimeter of. The perimeter is the distance around a shape, so one formula to find perimeter is simply adding all the side lengths together.
Not easily. You need to find the area or perimeter of the components and sum them.
It,s easy. a+b+c= perimeter