The circumference of a circle is the product of pi and the diameter. If d represents the diameter, d X pi = 50 cm or d = 50/pi = 16, to the justified number of significant digits.
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Diameter = circumference / PI = 50cm/3.1415 = 15.92cm
In any circle, the ratio of circumference to diameter is (pi).
mutiply by pi 3.14159265.............................................
Circumference = 2*pi*radius or diameter*pi
3.9 x 3.14 m