inare2.F

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C  _clean      SUBROUTINE INARE2(AREA)
!||====================================================================
!||    inare2   ../starter/source/interfaces/inter2d1/inare2.F
!||--- called by ------------------------------------------------------
!||    i3sti2   ../starter/source/interfaces/inter2d1/i3sti2.F
!||    i9sti2   ../starter/source/interfaces/int09/i9sti2.F
!||====================================================================
      SUBROUTINE inare2(AREA,YE ,ZE)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      my_real
     .   area
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      my_real
     .   fs2, fs3, ft2, ft3, e, f, g,ye(4) ,ze(4)
C
      fs2=-ye(1)+ye(2)+ye(3)-ye(4)
      fs3=-ze(1)+ze(2)+ze(3)-ze(4)
      ft2=-ye(1)-ye(2)+ye(3)+ye(4)
      ft3=-ze(1)-ze(2)+ze(3)+ze(4)
      e=fs2*fs2+fs3*fs3
      f=fs2*ft2+fs3*ft3
      g=ft2*ft2+ft3*ft3
      area=sqrt((e*g-f*f)/sixteen)
      RETURN
      END