# What is a dimension line?

**Lines that define the parameters of a dimension.**

Dimension lines are thin lines terminating in arrowheads. Place dimension lines no closer than 3/8" from the object outline. Parallel dimension lines should be a minimum of 1/4" apart. You may place parallel dimension lines more than 1/4" apart so long as the spacing between dimension lines is uniform throughout the drawing. Dimension lines are generally broken in the center of the line to provide a space for the dimension figure. Dimension figures for parallel dimension lines are staggered. In some structural or architectural drawings, you may find dimension figures placed above the dimension line.

### How many dimensions make up a line?

A line has one dimension- length. This is evident if we compare a line to a point and a plane figure. A point has no dimension; it merely marks a location. A plane figure, such as a square, circle, or triangle, has two dimensions. They have both length and height. A line is between a point and a plane figure. It has length, but it does not have width. ------------------------ 1 dimension. Here is a…