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VL : RetVal = (vla-AddArc Object Center Radius StartAngle EndAngle)

(vla-AddArc mspace pt1 rad sang eang)

• Object : ModelSpace Collection, PaperSpace Collection, Block
  The object or objects this method applies to.
• Center : Variant (three-element array of doubles); input-only
  The 3D WCS coordinates specifying the center point of the arc.
• Radius : Double; input-only
  The radius of the arc.
• StartAngle, EndAngle : Double; input-only
  The start and end angles, in radians, defining the arc. A start angle greater than an end angle defines a counterclockwise arc.
• RetVal : Arc object
  The newly created Arc object.

Example :

;Get the ModelSpace collection of the active document,
;select center point, input radius, start angle and end angle: 

(setq thisdrawing (vla-get-activedocument (vlax-get-acad-object)))

(setq mspace (vla-get-modelspace thisdrawing))

(setq pt1 (vlax-3d-point (getpoint "Center point: ")))

(setq rad (getreal "Radius of arc: "))

(setq sang (getangle "Start angle: ")

      eang (getangle "End angle: ")

)

(vla-addarc mspace pt1 rad sang eang)