Tutorial

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=πr ^{2} **

** **

Example: r=7

A=πr^{2}

A=π(7^{2})

A=π(49)

A=153.94