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)
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C = ~47.12 cm
double the radius to get the diameter = 30 multiply by pi (3.1415...) = 92.245 cm
circumference = 15*pi cm
Diameter of a circle = circumference/pi
The diameter of a circle with the circumference of 3.25 is: 1.034