You will also need the height of the cone.
From circumference you can calculate the radius (circumf/Pi = radius).
Volume of cone = 1/3 height x Pi x radius2
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Separate them into parts. First calculate the volume of the cylinder, then the cone and then add the results
Use the equation for the volume of a cone, replace the known height and volume, and solve the resulting equation for the radius.
Improved Answer:-Volume of a cone in cubic units = 1/3*pi*radius squared*height
A cone has 1/3 the volume of its cylinder. To find the volume multiply the area of the circular base (pi times radius squared) and multiply it by the height of the cone. That is the volume of the cylinder with the same dimensions. Divide this number by 3 to find the area of the cone. Use unit ratios to make sure your answer is in cubic centimeters.
In general the volume of a sphere is: 4/3*pi*radius cubed