Construction Aid Circle Arc > Radius - Object - Point (Construct Menu)

This command draws a Construction Aid circle arc which has a given radius, begins tangent to a given line (or Construction Aid line) or circle (or Construction Aid circle) and ends at a given point.

If a Construction Aid circle arc is to be drawn while working in isometric or dimetric view, then the command Construction Aid Ellipse Arc > Vector - Vector must be used, because the result on the page is elliptical not circular.

After choosing this command, a dialog appears in which a radius for the Construction Aid circle arc can be entered.

Any part of an existing object can be identified as a reference object. This can be the side of a rectangle or a circle arc within a surface. Ellipses and ellipse parts can not be identified.

The identified object is referred to as the "Reference Object".

The position at which the object was identified (the "ID point") has no effect on the rest of the command. As there are up to eight possible results, it would be too complicated to make a choice on the basis of the ID point.

The point at which the Construction Aid arc should end can be entered by clicking the mouse anywhere in the drawing.

After identifying the reference object and entering the point, all the possible arcs are calculated (the graphic shows one possible result).

The desired Construction Aid circle arc can then be chosen with the help of a small dialog. Only one circle can be chosen at a time.

If the distance from the point to the object is more than double the radius, then the arc can not be calculated. In this case, an error message appears.

The arc direction settings of existing arcs are not affected by changes to the current arc direction. To change the arc direction of an existing arc, use the command Transform Object to > Invert.