The circumference of a circle 5cm in radius is about 31.42cm
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The circumference of a circle if the radius is 5 cm is: 31.42 cm (radius x 2 x Pi = circumference).
Pi times the diameter of a circle gives its circumference. Since the radius is 5 cm, the diameter is 10 cm, and pi x 10 cm is the answer, or 31.4159 cm.
Circumference of circle: 2*pi*5 = 31.416 cm rounded to 3 decimal places
21.99113 approximately... * * * * * Accurate to 5 decimal places but WRONG by a factor of 2. Circumference = 2*pi*radius so radius = 7 cm => circumference = 43.98 cm.
The radius of the circle works out as 5 units in length