C = 2 pi r
C = 2xpix3cm
C = 6pi cm
C = 18.8495559 cm
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The circumference of a circle if its radius is 3 is about 18.85
The radius is 3.
The radius of the circle is 9.772 cm rounded to 3 decimal place and the circumference of the circle is 2*pi*9.772 = 61.399 cm rounded to 3 decimal places
circumference= pi(3.14) by the diameter. if your given the radius, double the radius and times by pi.
18.85 18.84....