The circumference of a planet is the distance round their widest part. On earth, it is measured round the equator.
The perimeter of a circle
They have a circumference which is 2*pi*radius or diameter*pi They have an area which is pi*radius2 They have sectors They have chords They have segments They have a total of 360 degrees around their circumferences They have arcs which is part of their circumferences They can have a tangent which is a straight line that touches it at one point
They are circumferences
It is the planet's diameter multiplied by pi
The answers depend on what you want to "do" and what information you have.
They are its circumferences
d = 9.55 cm
Only one.
First you times 3.14 by the diameter and there you go
The ratio of all lengths is the same. The ratio of the circumferences = ratio of the radii = 2:3
because its used to calculate areas of circle, circumferences and so on