CrossProduct

function CrossProduct(

  const pt1: TPoint64;

  const pt2: TPoint64;

  const pt3: TPoint64

):Double; overload;

function CrossProduct(

  const pt1: TPointD;

  const pt2: TPointD;

  const pt3: TPointD

):Double; overload;

function CrossProduct(

  const vec1: TPointD;

  const vec2: TPointD

):Double; overload;

function CrossProduct(

  vec1x: Double;

  vec1y: Double;

  vec2x: Double;

  vec2y: Double

):Double; overload;