Remember the circle eq'n
C = pi*d
Algebraically rearranging
d = C / pi
Hence
d = 52 pi / pi
Cancel down by 'pi'
Hence d = 52.
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circumference of the circle = pi*52 cm
The circumference of a circle, C, is pi*diameter. If 52 is the diameter, then the equation becomes: C = 3.14159 * 52 or C = 163.36 inches.
Pi is the ratio of the circumference of a circle to the diameter. Thus for any circle, if you divide the circumference by the diameter, you get a value close to pi.
The circumference of every circle is (pi) x (diameter).The circumference of this particular circle is 30 pi.
pi = 21.99/7 pi = circumference/diameter Just multiply your diameter by pi to get a circumference.