2 * pi * r
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It depends what shape you are trying to find. If it is a circle, use the following:C = DpiCircumference = Diameter x PiTake the diameter of the circle, or twice the radius, and multiply it by pi, which is ~3.14If it is any other shape, just add up the sides if they are given.
circumference of a circle = pi * diameter.
Use this formula: A = PI(r)2
Circumference of a circle = pi*diameter or 2*pi*radius
To find the area of half a circle, use the formula for a circle pi*r^2 divided by 2. pi = 3.14, r = radius (half the distance across the circle)