Changes

'''Cylindrical coordinates''' refers to a three-dimensional coordinate system used to describe the location of a point in space based on "r" in the x-y plane, the distance measured from the origin "θ", in addition to the angular measurement from the origin in the x-y plane, and z, the distance perpendicular to the x-y plane:  (r,θ,z).   

'''Cylindrical coordinates''' refers to a three-dimensional coordinate system used to describe the location of a point in space based on the distance from the origin in the x-y plane "r", the angle measured in the x-y plane between the point and the x axis "θ", the distance perpendicular to the x-y plane:  (r,θ,z).   

In a sense, cylindrical coordinates are [[polar coordinates]] with a third dimension added: (r,θ) correspond to the polar coordinates for (x,y). This is in contrast to [[spherical coordinates]], where z is replaced by an angle, just like x and y are in polar coordinates.

In a sense, cylindrical coordinates are [[polar coordinates]] with a third dimension added: (r,θ) correspond to the polar coordinates for (x,y). This is in contrast to [[spherical coordinates]], where z is replaced by an angle, just like x and y are in polar coordinates.