What type of line is typically used to indicate hidden edges on a blueprint?

The use of a dashed line is standard for indicating hidden edges on a blueprint. These lines represent features that are not directly visible in the current view of the object or assembly being illustrated. The dashed line helps clarify the presence of these hidden edges, allowing for a more complete understanding of the part or assembly's geometry. This is essential for accurate interpretation and fabrication, as it provides critical information that would not otherwise be seen from the existing viewpoint.

Visible lines, on the other hand, are used to represent the edges and outlines of objects that are directly observable. Construction lines are typically used as guidelines during the drafting process and do not convey final features or edges. Leader lines serve a distinct purpose by connecting annotations, such as dimensions or labels, to specific features, rather than denoting hidden edges. Each type of line serves an important function in technical drawings, but the dashed line specifically addresses hidden edges appropriately.