The formula for the area of a circle is a little more difficult and requires methods of successively better approximations.

The usual definition
of π is
the ratio of the circumference of a circle to its diameter d, so that the
circumference of a circle is πd, or 2πr,
where r is the
radius.

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Animations by
Bettina Richmond and Tom Richmond.

Tom.Richmond@wku.edu

Updated May 22, 2008.