What type of lines are used to indicate the distance between two points in a sketch?

Dimension lines are specifically designed to indicate the distance between two points in a sketch. They provide a precise measurement that specifies the size or location of objects within the drawing. Dimension lines are typically associated with arrows at each end to show the exact lines of measurement and often include numerical values to denote the distance clearly. This clarity is essential in engineering drawings, as it allows for accurate interpretation and execution of specifications.

The other types of lines serve different functions. Section lines are used to indicate areas of a drawing that have been cut through for a sectional view, illustrating internal features. Construction lines are lightly drawn lines that serve as guides for creating more definitive lines; they help in laying out the drawing without being part of the final presentation. Centre lines indicate the symmetrical axis of an object, helping to locate the centers of circles or to align parts, but they do not convey distance. Each type of line has a distinct purpose and understanding these functions is crucial for proper interpretation of engineering drawings.