Extension lines are lines projecting from an object to show the extent of a dimension.

Extension lines are lines projecting from an object to show the extent of a dimension.

• A. Dimension
• B. Leader
• C. Extension
• D. Break

Answer: (C)

In technical drawings, different lines convey different parts of a measurement. Extension lines extend from the object’s edges to indicate exactly where a measurement applies, marking the start and end points of the feature being measured. They are thin, unobtrusive lines that project out to the dimension line and help define the extent of the dimension without cluttering the drawing. The dimension line itself carries the numeric value with arrowheads at its ends, showing the measured distance between those extension lines. This keeps the measurement clear and precise. Leader lines connect notes to a feature, and break lines indicate a portion of a drawing is omitted; neither describes lines projecting from the object to show the extent of a dimension. Therefore, the term that fits this description is extension lines.

In technical drawings, different lines convey different parts of a measurement. Extension lines extend from the object’s edges to indicate exactly where a measurement applies, marking the start and end points of the feature being measured. They are thin, unobtrusive lines that project out to the dimension line and help define the extent of the dimension without cluttering the drawing. The dimension line itself carries the numeric value with arrowheads at its ends, showing the measured distance between those extension lines. This keeps the measurement clear and precise. Leader lines connect notes to a feature, and break lines indicate a portion of a drawing is omitted; neither describes lines projecting from the object to show the extent of a dimension. Therefore, the term that fits this description is extension lines.