Copyright Goodheart-Willcox Co., Inc. 82 AutoCAD and Its Applications—Advanced To draw the cone so that its axis projects from the center of the sphere, you will need to change the UCS. This is discussed later in the chapter. Introduction to Cylindrical Introduction to Cylindrical Coordinates Coordinates Locating a point in space with cylindrical coordinates is similar to locating a point on an imaginary cylinder. Cylindrical coordinates have three values. The fi rst value represents the horizontal distance from the origin, which can be thought of as the radius of a cylinder. The second value represents the angle in the XY plane, or the rotation of the cylinder. The third value represents a vertical dimension measured up from the polar coordinate in the XY plane, or the height of the cylinder. See Figure 4-4. The absolute cylindrical coordinate shown in the fi gure is: 7.535,6 Figure 4-3. The axis lines of objects drawn in the same user coordinate system are parallel. Notice that the cone does not project from the center of the large sphere. 7.535,6 Z value Angle in the XY plane Horizontal distance Figure 4-4. Cylindrical coordinates require a horizontal distance from the origin, an angle in the XY plane, and a Z dimension.