Constrains the angle between line or polyline segments, the angle swept out by an arc or a polyline arc segment, or the angle between three points on objects.
This command is equivalent to the Angular option in DIMCONSTRAINT.
When you enter or edit an angle value that is either negative or is greater than 360 degrees, the number entered is stored for the expression (for example, 390), but the value displayed is based on the formatting of the units (for example, 30 if decimal degrees).
When an expression with variables evaluates to greater than 360 or less than 360, the constraint value is displayed in the Parameters Manager based on the units of the drawing.
The following table outlines the valid constraint objects and points:
Valid Objects or Points 
Characteristics 

Pair of lines Pair of polyline segment Three constraint points Arc 

The following prompts are displayed.
Selects a line object.
Specifies the first line to be constrained.
Specifies the second line to be constrained.
Determines where the dimension line is located on the constrained object.
Selects an arc and constrains the angle.
Specify dimension line location.
Selects three valid constraint points on the object.
Specifies the angle vertex, which is at the centerpoint of the constraint.
Specifies the first angle endpoint of the arc.
Specifies the second angle endpoint of the arc.
Specify Dimension Line Location