What type of lines on a blueprint terminate with arrows?

Dimension lines are used on blueprints to indicate the measurements of various elements within the drawing. They provide the lengths, widths, heights, and other relevant dimensions necessary for construction. The arrowheads at the ends of dimension lines signal the extent or limits of the dimension being measured, indicating exactly what distance is being referenced. This makes it clear to anyone interpreting the blueprint how far apart or how large certain elements should be constructed.

In contrast, boundary lines typically outline the edges of the property or building but do not feature arrows. Center lines often indicate symmetrical axes in a design and also do not include arrowheads, as they are used to showcase points of symmetry rather than dimensional measurements. Section lines indicate where a cut is made through a structure for providing a view in a section drawing and are also distinct from dimension lines in their format and purpose. Therefore, dimension lines are specifically designed with arrows to convey precise measurement information effectively.