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How do you calculate the area of a circle?

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The area of any circle can be determined by using the formula

A = πr²
where:
A is the area of the circle,
r is the radius of the circle,
π is a constant, the ratio of any circle's circumference to its diameter, approximately equal to 3.141592653589793238462643383279502884197169399375105820975.

See also Wikipedia:Area of a disk.

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