3D cylindrical coordinates specify a location by a distance from the UCS origin in the XY plane, an angle from the X axis in the XY plane, and a Z value.
Cylindrical coordinate entry is the 3D equivalent of 2D polar coordinate entry. You specify a point using the following syntax:
X < angle , Z
In the illustration below, 5<30,6 indicates a point 5 units from the UCS origin, 30 degrees from the X axis in the XY plane, and 6 units along the Z axis.
Absolute and Relative Cylindrical Coordinates
As with 2D coordinates, you can enter absolute coordinates, which are based on the origin, or you can enter relative coordinates, which are based on the last point entered.
To enter relative coordinates, use the @ sign as a prefix. For example, @4<45,5 specifies a point 4 units in the XY plane from the previous point, at an angle of 45 degrees from the positive X axis, and at 5 units in the positive Z direction.