In architectural and interior design drafting, a dashed line is the standard convention for representing a hidden object. On a floor plan, this line type indicates elements that are located above the standard 4-foot (1.2-meter) cut plane and are therefore not directly visible. Examples include upper wall cabinets, soffits, ceiling beams, or the edge of a feature on the ceiling. The dashed line allows these overhead elements to be documented in relation to the floor plan without being confused with objects at or below the cut plane.

B. Light cove edge: While a light cove edge would be shown with a hidden line, this is a specific example, not the general definition of the line type itself.

C. Pattern on the floor: A pattern on the floor is visible and would be drawn with solid lines or a specific hatch pattern, not a dashed line.

D. Item to be removed: Items designated for removal are shown on a demolition plan, which uses specific line conventions that are distinct from standard construction drawings.

1. Ching

F. D. K. (2015). Architectural Graphics (6th ed.). John Wiley & Sons. In Chapter 3

"Orthographic Drawing

" the section on Plan Drawings illustrates that dashed lines (hidden lines) are used to "indicate the presence of significant objects above or below the cutting plane" (p. 84

Figure 3.51 "Plan Line Types").

2. United States National CAD Standard® (NCS) V6. (2014). Uniform Drawing System (UDS) Module 02: Sheet Organization. National Institute of Building Sciences. Section 2.3.2

"Line Types

" defines the "HIDDEN" linetype as dashed lines used to represent "edges of an object that are behind or under another object." This principle extends to objects above the cut plane in a plan view.

3. MIT OpenCourseWare. (2004). 4.111 Introduction to Architecture & Environmental Design

Spring 2004. Lecture 10: Drawing and Representation. Massachusetts Institute of Technology. The lecture notes on orthographic projection explain that hidden lines are used to represent edges that are not visible from the current viewpoint

which in a floor plan includes elements above the cut plane.