Individuals understand the principles of triangulation and how this sheet metal layout method can be used to measure duct run fittings. They can explain how this process uses trigonometry to lay out patterns and calculate true lengths. They can identify and describe types of fittings that are often laid out and fabricated using triangulation, such as square-to-round fittings, roof collars, stacks and caps, and fittings that join at unusual angles.

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