(defun c:test ()
  (setq obj (vlax-get-acad-object)doc (vla-get-ActiveDocument obj) msp (vla-get-ModelSpace doc))
  (setq merkez '(0 0 0)
yaricap 10
baslangic_acisi 0.349066  ; 20 derece
bitis_acisi 1.0472)       ; 60 derece)
(vla-addarc msp (vlax-3d-point merkez) yaricap baslangic_acisi bitis_acisi)
(princ))