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# Area and Circumfrence of a Circle

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Tutorial

## Circumference and Area of a Circle

The Circumference of a circle is is the distance around the circle.

Circumference of a Circle - The circumference C of any circle with radius r and diameter d is determined by the formula

C=2πr    or     C=πd

Example:        r=7

C=2πr

C=2π(7)

C=14π

C=43.98

Area of a Circle - The area of a circle with radius is determined with the formula

A=πr2

Example:        r=7

A=πr2

A=π(72)

A=π(49)

A=153.94