Smart Dimension

A single command to creates different type of dimensions by select object

Linear

Creates a linear dimension with a horizontal, vertical or rotated dimension line

Annotate tab > Dimensions panel > Dimension

Hover over a line (make sure not snapping to any object snap point)
A linear dimension preview
Click to select the line

Pick point to place the dimension

Aligned

Creates a linear dimension that is parallel to the selected object

Hover over a slant line to display the preview
Click the line

Pick point to place the dimension

Angular

Measures the angle between selected objects

Hover over a line and select

Hover over another line to preview, click to select the line.

Pick point to place the dimension

Radius

Measures the radius of a selected circle or arc and displays the dimension text with a radius symbol

Hover cursor over an arc, radius dimension preview automatically
Click to select the arc

Pick point to position the dimension

Diameter

Measures the diameter of a selected circle or arc, and displays the dimension text with a diameter symbol.

Hover over a circle to display preview, and select the circle.

Pick point to place the dimension