You need to know the radius first. Next you simply double the radius to get the diameter and then multiply that by pie and you have now worked out the circumference of your circle :)
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the way you find the circumference is 2xpixr or pixdiameter. so it would be 2x80xpi
The circumference of a circle is its perimeter
Circumference and the formula for circumference is C=πd or C=2rd
if a circle has an 18 meter diameter, then it has a 9 meter radius the circumference of a circle is 2(pi)r so the c. would be 2(pi)(9) which is 18pi. (another way to think of circumference is the diameter times pi)
since the circumference of a circle is pi*diameter, the diameter would be equal to 11pi. You CAN multiply 11 by pi, but it isn't really helpful in any way IN THIS CASE