An arc
The fraction of the circumference of a circle can be expressed in relation to its diameter. The circumference (C) is calculated using the formula C = πd, where d is the diameter. Thus, the fraction of the circumference to its diameter is π:1, meaning that for every unit of diameter, the circumference is approximately 3.14 times that length. This ratio is a fundamental property of circles.
circumference = 2*pi*radius or pi*diameter
It is an arc
The converse of the statement "If two circles have the same diameter, then they have the same circumference" is "If two circles have the same circumference, then they have the same diameter." This means that if you know two circles share identical circumferences, you can conclude that their diameters are also equal.
The circumference of a circle = pi*diametre = 2pi*radius
The equator.
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.
Pi times the diameter of a circle gives its circumference.
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
Then they are similar.
Circumference is a special name for a circles perimeter. I think the answer you are looking for is radious.
Any circle's circumference can be calculated with the formula 2(pi)*radius