If the shape is a regular polygon or curve there are formula for each shape.
If the shape is irregular you will have to measure each piece of the shape's edge and sum all the pieces together.
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There is no simple answer. You need to calculate (or measure) the length of each side and add them together.
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.
You have to add all the sides of the 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 perimeter of a shape such as a polygon is the sum of its sides.