-- Measure or figure out the length of each side.
-- Add up all the lengths of all the sides.
-- The answer is the perimeter of the shape.
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Perimeter is the outside of a shape
Perimeter is the outside. The area is the inside of a shape.
The perimeter of a shape is the distance around the outside. For a shape with straight sides, the perimeter is the sum of the length of the sides. The perimeter of a circle is called the circumference, and is calculated by multiplying the diameter by pi.
The formula for the perimeter of a shape depends on the shape. It is the sum of the lengths of all the sides that enclose the shape.
If you want to enclose a certain area, the shape that does it with the shortest perimeter is a circle.