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To find the area of a circle when given its circumference, you can use the formula:
Circumference = 2 * π * radius
4Ï€ = 2Ï€ * radius
radius = 4/2 = 2
Next, use the formula for the area of a circle:
Area = π * radius^2
Area = π * 2^2
Area = 4Ï€
Therefore, the area of the circle is 4Ï€ square units.