double the radius to get the diameter = 30
multiply by pi (3.1415...) = 92.245 cm
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The radius is 1.27cm
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)
circumference = 15*pi cm
If a circle circumference is 30 the radius is: 4.77
The radius of a circle with a circumference of 59 is: 9.39