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Diameter = Radius*2 = 30 cm.
C = ~47.12 cm
double the radius to get the diameter = 30 multiply by pi (3.1415...) = 92.245 cm
The formula for the circumference of a circle is C = 2πr where r is the radius. This formula can also be expressed as C = πd where d is the diameter as the diameter is twice the radius. C = 15π = 47.12cm (2dp)
15cm = 5.9 inches.