Creating the other pipe section

1. Choose Geometry Create Point and enter points (-20, 9) and
   (-20, 11). Press ESC to conclude the creation of points.

2. From the Copy window, select Points and Rotation. Enter an angle of 180 degrees and from the Do extrude menu, select Lines. Since the rotation may be done on the xy plane, choose Two Dimensions. The center of rotation is (-20, 0, 0).

3. Click Select and select the two points just created. Repeat the process, this time entering an angle of -180 degrees.

4. From the Copy window, select Lines and Translation. In First Point and Second Point, enter the points defining the translation vector. Since this pipe section must also measure 40 length units, the vector is defined by points (0, 0, 0) and (0, 0, 40).

5. From the Do extrude menu, select the option Surfaces.

6. Click Select to select the lines that define the cross-section of the second pipe. Press ESC to conclude the selection.

Figure 25. A rendering of the two intersecting pipes