An arc
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circumference = 2*pi*radius or pi*diameter
Circles do have a perimeter, which is known as the circumference. The circumference is worked out by multiplying:2, Pi, Radius (r)Pi, Diameter (d)Hope that's helpful for you!
It is part of a curve. If that curve happens to be a circle, then it is a fraction of a circumference but it need not be.
Then they are similar.
Circumference = Pi * D (the diameter) Therefore D = Circumference / Pi Naturally all circles have a circumference, but if this value is known then we can find the diameter by dividing this value by Pi. (Note: Pi is a special number and we can only ever use an approximation to its value.)