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Area and Circumfrence of a Circle

Area and Circumfrence of a Circle

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Author: Brandon Wilson
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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