Measure the lengths of all its sides and add them together.
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You find perimeter by adding all the sides of a figure.
All you do is add up all the sides to find the perimeter even though it is a odd shape
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.
It is not possible to do so.
In general you cannot find the perimeter of any shape if only the area is given.