Area_Tri_2D Function

public function Area_Tri_2D(S1, S2, S3)

Arguments

Type	Intent	Optional	Attributes		Name
type(Vect2D),	intent(in)			::	S1
type(Vect2D),	intent(in)			::	S2
type(Vect2D),	intent(in)			::	S3

Return Value real(kind=C_DOUBLE)