Create angular dimensions

1	When you start the Smart Dimension command, the program prompts you to select an entity. Click to select a line or edge. Select the entity anywhere along its length except at a Snap point.
2	Move the cursor over another linear entity that isn't parallel with the first entity. Notice that the program displays an angular dimension which moves as you move the cursor. Note that if you move the cursor off the second entity or onto a Snap point, the dimension type changes from an angular to a linear dimension.
3	Click to select the second entity.
4	You are prompted to enter the origin. To create the angular dimension, simply specify the location of the dimension line. As soon as you select the point, the program immediately creates the angular dimension measuring the angle formed by the two lines.

Properties
By clicking on the Properties Option, the Entity Properties window shows up, that enables you to control appearance of the Dimension and Text entities.