DXF Group Codes
ENTITIES Section
ARC

The following group codes apply to arc entities.

Arc group codes
Group codes 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

100

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