Circumference of a Circle

Written by Jerry Ratzlaff on . Posted in Plane Geometry

circle diameter 4

  

Circumference of a Circle formulas

\(\large{ C = 2 \; \pi \; r }\)

\(\large{ C = \pi \; d }\)

\(\large{ C = 2 \; \sqrt{ \pi \; A} }\)

\(\large{ C = \frac{ 2 \; A }{ r } }\)

Symbol English Metric
\(\large{ C }\) = circumference \(\large{ in }\) \(\large{mm  }\)
\(\large{ A }\) = area \(\large{ in^2 }\)  \(\large{ mm^2 }\)  
\(\large{ d }\) = diameter \(\large{ in }\) \(\large{mm  }\)
\(\large{ \pi }\) = Pi \(\large{3.141 592 653 ...}\)
\(\large{ r }\) = radius \(\large{ in }\) \(\large{mm  }\)

 

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