You have to add all the sides of the shape .
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Compute = calculate; perimeter = measurement of the outside edge.
Perimeter of a round plate = 2*pi*radius or pi*diameter
Perimeter = 4 times the square root of the area.
You don't. Perimeter is a concept associated with plane figures, not solid shapes.
-- 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.