The TANLINE command can be used to draw a tangent line between any two ARC or CIRC elements. Provided that the current element is a STRA, the syntax to create a tangent line would be, for example:

Figure 19:15.: Use of the TANLINE command to give a Tangent Line shows various examples of the use of the tangent line facility. Notice how (right-most illustration) the tangent line may lie on the complement of an ARC.