Introductioin of a circle has no meaning - please rephrase the question.
The width, or the length of a circle are its diameter.
It is the length of the base of the semi-circle.
The circumference of a circle is the length of the circle's perimeter.
It'll be the largest chord of the circle.
length=n/360*2*pi*radius
If you have only the arc length then you cannot find the diameter.
the fraction of the circle covered by the arc
if the segment is the whole length of the circle divide it by 2
radius = diameter/2
It depends on what information you do have.
the circumference of a circle is the length around the outer edge. and you find it by using the formula 2 times pi times the radius of the circle
There are a couple of different ways of finding the length of the chord of a circle. Probably the best is what is called the half angle formula.