What auxiliary method is used to layout a fitting?

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The use of auxiliary lines is vital for accurately laying out a fitting in HVAC sheet metal work. Auxiliary lines are additional lines drawn in a layout that help in establishing points, angles, or measurements that are not directly obtainable from the main edges or features of the material being worked on. They provide a reference that makes complex shapes easier to visualize and construct. By using these lines, a technician can ensure that the dimensions and angles of the fitting are precise, leading to a better fit and overall quality in the final installation.

In contrast, while bisectors and perpendiculars are useful tools in geometry for dividing angles and creating right angles respectively, they are not primarily referenced as auxiliary methods for layout purposes in sheet metal fabrication. Segmented lines may also be used in drawings but don't carry the same significance or direct application in laying out fittings as auxiliary lines do. This highlights why auxiliary lines are recognized as an essential technique in this specific context.

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