Cylindrical coordinate system
A coordinate system in which you specify r, 
, and z for the location of an object:
, and z for the location of an object:■r is the distance in the xy plane to the location. r is measured from the origin to the point projected onto the xy plane.
■ is the angle in the xy plane to the location. is measured from the x-axis to the line connecting the origin and the location projected into the xy plane. is positive using the right-hand rule about the z-axis.
is the angle in the xy plane to the location. is measured from the x-axis to the line connecting the origin and the location projected into the xy plane. is positive using the right-hand rule about the z-axis.■z is the distance to the location along the z-axis.
