An angular constraint controls the angle between two line or polyline segments, or the angle of an arc.
angular dimension represents the angle between two lines or three points, an angular constraint parameter defines and controls the angle.
While anIn the example below, the polygon on the left has an angular constraint of 30 degrees applied to one corner of the polygon. When one point on that polygon is manipulated, the result is the polygon on the right. The constrained corner will remain at 30 degrees, while the geometry of the polygon will change to keep that angle.