What is the term for lines that project from a dimension to show the extent of the dimension?

What is the term for lines that project from a dimension to show the extent of the dimension?

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

Answer: (B)

In technical drawings, extension lines are the lines that extend from a feature of the object to the dimension line to show the extent of the measurement. They start just past the edge of the feature and run to the dimension line, making it clear which feature the dimension applies to without crowding the drawing. The dimension line itself carries the measurement with arrowheads at both ends, and the numeric value sits near it. Leader lines connect notes or callouts to a feature, not to indicate the distance of a dimension, and breaks are used to shorten long lines for readability. So, the lines described are extension lines.

In technical drawings, extension lines are the lines that extend from a feature of the object to the dimension line to show the extent of the measurement. They start just past the edge of the feature and run to the dimension line, making it clear which feature the dimension applies to without crowding the drawing. The dimension line itself carries the measurement with arrowheads at both ends, and the numeric value sits near it. Leader lines connect notes or callouts to a feature, not to indicate the distance of a dimension, and breaks are used to shorten long lines for readability. So, the lines described are extension lines.