It is the planet's diameter multiplied by pi
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
An arc
They are circumferences
The answers depend on what you want to "do" and what information you have.
They are its circumferences
Only one.
d = 9.55 cm
The ratio of all lengths is the same. The ratio of the circumferences = ratio of the radii = 2:3
First you times 3.14 by the diameter and there you go
whats the circumferences of r=8
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