the perimeter of a circle, also known as the circumference, is calculated by diameter multiplied by pi. Alternatively : 2 x radius x pi
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Known as the Circumference
Assuming you know the radius - the formula is Pi x Radius2
Compute = calculate; perimeter = measurement of the outside edge.
Perimeter = 4 times the square root of the area.
You don't. Perimeter is a concept associated with plane figures, not solid shapes.