- On the ribbon, click
Annotate tab
Dimension panel
Dimension
. 
- In the graphics window, select the geometry and drag to display the dimension.
- To add a linear dimension for a line or edge, click to select the geometry.
- To add a linear dimension between two points, two curves, or a curve and a point, click to select each point or curve.
- To add a linear symmetric or linear diametric dimension, select two parallel lines or edges, right-click, and then select Dimension TypeLinear Symmetric or Linear Diametric.
- To add a radial or diametric dimension, click to select an arc or circle. Tip: Leader lines of radial or diametric dimensions snap in 15-degree steps. Hold the CTRL key on your keyboard to disable leader line snapping. Then place or move the leader line to the desired position.
- To add an angular dimension, select two lines.
- To add an implied intersection dimension, select the first curve, right-click, and then select the intersection. Select the second curve that defines the implied intersection, and then select the element (or other implied intersection) to dimension.
- To annotate an arc segment with a chord length, arc length, or angular dimension, select the arc, right-click, and then select Dimension TypeChord Length, Arc Length, or Angle.
Tip: Selected objects in the drawing determine the type of dimension and commands available in the context menu. To change the settings or use different options, right-click, and click a command on the menu. - Click to place the dimension in the appropriate location.
Show Me how to create an aligned dimension
Show Me how to dimension one linear element
Show Me how to dimension between two lines
Show me how to create an exterior angular dimension
Show Me how to create an interior angular dimension
Show Me how to create 3-point angular dimensions
Show Me how to dimension a diameter
Show me how to dimension a radius