The following group codes apply to arc entities. In addition to the group codes described here, see Common Group Codes for Entities. For information about abbreviations and formatting used in this table, see Formatting Conventions in This Reference.
Arc group codes
Group code
Description
100
Subclass marker (AcDbCircle)
39
Thickness (optional; default = 0)
10
Center point (in OCS)
DXF: X value; APP: 3D point
20, 30
DXF: Y and Z values of center point (in OCS)
40
Radius
Subclass marker (AcDbArc)
50
Start angle
51
End angle
210
Extrusion direction (optional; default = 0, 0, 1)
DXF: X value; APP: 3D vector
220, 230
DXF: Y and Z values of extrusion direction (optional)
