What names a location in the circle?

Answer 1

A particular location is described by it's coordinates. There are several types of coordinates, the most simple and popular is known as Cartesian coordinates. This type of coordinate can name a real location in a two dimensional space. Cartesian coordinates in 2-D have 2 entries, commonly represented as (x,y) on an x-y graphical system For circles, consider radial coordinates. Radial coordinates in 2-D have 2 entries, commonly represented as (σ,r). σ denotes an angle (usually in radians) r represents a magnitude (length).