It is an arc
An arc is a portion of the circumference
An arc is a portion of the circumference of a circle.
circumference = 2*pi*radius or pi*diameter
An arc
The circumference of a circle = pi*diametre = 2pi*radius
The equator.
Then they are similar.
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
Pi times the diameter of a circle gives its circumference.
Okay, for starters, circumference is used only for circles and spheres. the UK is neither so therefore it has no circumference.
A part of the circumference is called an arc. If the circumference is split into two unequal arcs then the larger portion is referred to as the major arc and the lesser portion as the minor arc.
Any circle's circumference can be calculated with the formula 2(pi)*radius