What are hidden lines used to indicate in technical drawings?

Hidden lines in technical drawings are specifically utilized to indicate edges and surfaces that cannot be seen from the viewer's perspective in a particular view. These lines are typically represented as dashed or dotted lines and help convey important information about the internal features of an object or structure that are not directly observable. This is crucial for architects, engineers, and designers to communicate details effectively, as it allows anyone reviewing the drawings to understand the complete form of the object, including its hidden features.

In contrast, visible edges and surfaces are represented by solid lines, while dimensions of the drawing are indicated using specific notation and symbols. Structural components are typically highlighted through various line styles or notations but do not specifically rely on hidden lines. Hence, hidden lines serve a unique and critical function in technical drawings by revealing details that would otherwise remain obscure.