면적 리습 소수점 다섯째자리로 수정하는 방법 알려주세요.

(defun c:ae(/ choi d_ts w_os grpt pt1 ent1 en1 ar1 ar2 ar3 ar4 ar5 an arm ht)
   (setq choi (getvar "orthomode")  d_ts (getvar "textsize")
            w_os (getvar "osmode") )
   ;;(setvar "orthomode" 0) (setvar "osmode" 0)
   (setq ht d_ts)
   (prompt "nText Height<") (prin1 ht) (prompt ">: ")
   (setq ht (getdist))
   (if (= ht nil) (setq ht d_ts))
   (setq ent1 (entsel  "nPline 선택->"))
   (setq en1 (car ent1)) (redraw en1 3)
   (setq grpt (grread T))
   (setq pt1 (cadr grpt))
   (command "area" "e" ent1)
   (setq ar1 (/ (getvar "area") 1.0e+02))
   (setq ar2 (rtos ar1 2 0))
   (setq an (strlen ar2))
   (setq arm (substr ar2 (- an 1) 1))
   (setq arm (atof arm))
   (setq ar3 (atoi ar2))
   (if (>= arm 5)(progn
       (setq ar3 (+ ar3 100))
   ))
   (setq ar3 (rtos ar3 2 0))
   (setq ar4 (strcat (substr ar3 1 (- an 4)) "." (substr ar3 (- an 3) 2)   ))
   (if (= (substr ar4 1 1) ".") (setq ar4 (strcat "0″ ar4)))
   (setq ar5 (strcat (substr ar2 1 (- an 4)) "." (substr ar2 (- an 3) 5)   ))
   (if (= (substr ar5 1 1) ".") (setq ar5 (strcat "0″ ar5)))
   (prompt "nArea : ")(prin1 ar5) (prompt "  or  ")(prin1 ar4)(terpri)
   (command "text" "j" "r" pt1 ht "0″ ar5)
   (prompt "nEnter text point->")
   (command "move" "l" "" pt1 pause)
   (redraw en1 4)
   (setvar "orthomode" choi) (setvar "osmode" w_os)
   (prin1)
)