The live dimensions and guides are design aids that appear in the graphics window when you create, place, and manipulate geometry.

The live dimensions display either the x- and y-coordinates of the pointer relative to the grid origin, the base point, or the distance of the pointer from a guide reference.

A guide is a dynamic line that indicates a relationship between the pointer location and a referenced geometric entity. You can use a geometric entity as a temporary guide reference. Temporary guide references update as you work. Point to a geometric entity to automatically add or remove to the guide reference list. You can also set the time it takes to add an entity as a guide reference to the guide reference list and set the size of the guide reference list. You can convert guides into constraints and vice versa.