On an assembly drawing, hidden parts are represented by what type of lines?

Hidden parts in an assembly drawing are represented by dashed lines. This convention helps to clearly indicate features that are not visible from the particular viewpoint being displayed in the drawing. Dashed lines are used to represent edges or surfaces that are behind or obscured by other components, allowing the viewer to understand the complete assembly without cluttering the drawing with unnecessary details.

The use of dashed lines is universally understood in technical drawings, making it easier for engineers, architects, and builders to interpret designs effectively. By maintaining this standard, individuals reviewing the drawing can focus on the visible aspects of the assembly while still being informed about the hidden features that are critical to the overall understanding of how components fit together.