the diameter mutliplied by pi is the circumference.
From a different view the circumference divided by diameter is pi.
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for where pi = 3.14159265500:500 * pi = 1,570.79633
Yes. you need to know the diameter or radius of the circle and then the formula is:- Circumference = Pi*Diameter or Circumference = 2Pi*Radius. An approximate value for Pi is 3.14159.
The circumference is Pi multiplied by the diameter. In this case, the circumference is 18Pi. We can only approximate this since Pi is an irrational number. The circumference is about 56.55 inches.
pi = circumference / diameter
The circumference of a circle equals the diameter * pi, where pi is a constant with an approximate value of 3.14. So, to answer your question, the circumference of your circle is about 6.283 inches.