An object Arc is always internally defined using three definition points. However, to simplify its specification, it is possible to define an Arc graphically in multiple ways using:
It is also possible to specify Arc numerically using its parameters:
A change of any of these parameters results in a change of locations of one or more definition points. Which point is to be changed can be influenced in the "Adjustable Point" Combo-box.
Arcs can be entered either graphically using a cursor (most common) or using the New Arc dialog window.
In addition to the General Tab in the New Line dialog window, the Edit Line dialog window has also the Arc Tab (below). A list of points defining the arc are given in the General Tab, while coordinates of points defining the arc, its center, and other parameters are entered in the Arc Tab.
The Arc can be edited using the same dialog window.