Which line type projects from the object specifically to locate a dimension, extending from the feature to the dimension line? Identify the correct drafting line used to anchor dimension values to features.

Introduction / Context:
Dimensioning uses a small set of standardized line types so anyone reading the drawing understands what is being measured and where. Recognizing each line's role is essential for clear, standards-compliant documentation.

Given Data / Assumptions:

• Dimensioning consists of extension lines, dimension lines, arrowheads/terminators, and numerical values.
• The question asks for the line that extends from the object's feature to the dimension line.
• Line-type standards (visible/hidden/center/etc.) are assumed known.

Concept / Approach:

Extension lines originate a short distance from the object edge and project outward, showing exactly which points or surfaces are being dimensioned. The dimension line lies between extension lines and carries the numerical value with arrowheads pointing to the extension lines.

Step-by-Step Solution:

Verification / Alternative check:

Any dimensioning guideline shows extension lines as thin continuous lines extending from the object, offset slightly to avoid merging with edges.

Why Other Options Are Wrong:

Visible: represents object outlines.

Hidden: represents edges not directly visible.

Dimension: carries the dimension text/arrowheads, not the projection from the feature.

Common Pitfalls:

Letting extension lines touch the object line (keep a small gap) and mismatching line weights between object and dimensioning lines.

Final Answer:

extension