﻿## 0
By default, arcs are defined by two endpoints and radius. If necessary, you can add the arc center to the definition. In such case, the endpoints must be explicitly calculated if they are constrained - otherwise they may not be at the radius distance from the center.
## 4
Selecting arc definition change
## 6
Confirmation of change after the arc was selected
## 11
Selecting vertexes for a constraint in X direction to the coordinate center
## 16
A new distance for the vertexes was defined. Because the vertexes are constrained in one direction, the vertex common for the arc and the line is recalculated automatically. Distance in X direction is defined for the constraint; the vertex must be also at the radius distance from the arc center. Location of vertex is calculated automatically.
## 23
Opposite vertexes were constrained similarly.
