An online calculator to calculate the area \( A \) , the perimeter \( P \) and the radius \( r \) of a circle given any of these parameters:
\( P = 2 \pi r \) , \( A = \pi r^2 \)
\( r = \dfrac{P}{2 \pi} \) , \( A = \dfrac{p^2}{4 \pi} \)
\(r = \sqrt{\dfrac{A}{\pi}} \) , \( P = 2 \sqrt{\pi A} \)
Enter any ONE value - radius, circumference, or area
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