# What is a dimension line?

A dimension line is a thin line running parallel to a particular dimension of an object that describes the parameters of the dimension. It has arrow heads at both ends.

Dimension lines help in the clear and comprehensive description of an object. There are conventions used to eliminate ambiguities in the use of dimension lines. For instance, lines should be placed no closer than 3/8 inch from the outline of the object. They are also often broken in the middle to create space for indicating the value of the dimension. In case space is limited, the arrow heads at the ends of a dimension line can be substituted with a heavy black dot.

Q&A Related to "What is a dimension line?"
 a line is a 2D figure. http://wiki.answers.com/Q/What_dimension_is_a_line...
 ( də′men·chən ′līn ) (graphic arts) A line on a drawing pointing to another line or part to which the dimensions relate. http://www.answers.com/topic/dimension-line
 A standard outdoor running track has a length of 400 meters, with two bends and two parallel straights, both radii of which are equal. Typically, the inside area of the track accommodates http://www.ehow.com/info_8232920_dimensions-runnin...
 Given that others have articulated the linear algebra of dimension (in a less technical sense) I'll try to give some motivation for why dimension is important in String Theory. In http://www.quora.com/What-is-a-dimension-1