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  Trigonometric \Trig`o*no*met"ric\, Trigonometrical
  \Trig`o*no*met"ric*al\, [Cf. F. trigonom['e]trique.]
     Of or pertaining to trigonometry; performed by the rules of
     trigonometry.
     [1913 Webster] --{Trig`o*no*met"ric*al*ly, adv.
     [1913 Webster]
  
     Trigonometrical curve, a curve one of whose co["o]rdinates
        is a trigonometric function of the other.
  
     Trigonometrical function. See under Function.
  
     Trigonometrical lines, lines which are employed in solving
        the different cases of plane and spherical trigonometry,
        as sines, tangents, secants, and the like. These lines, or
        the lengths of them, are trigonometrical functions of the
        arcs and angles to which they belong.
  
     Trigonometrical survey. See under Survey.
        [1913 Webster]

  Trigonometric \Trig`o*no*met"ric\, Trigonometrical
  \Trig`o*no*met"ric*al\, [Cf. F. trigonom['e]trique.]
     Of or pertaining to trigonometry; performed by the rules of
     trigonometry. --{Trig`o*no*met"ric*al*ly, adv.
  
     Trigonometrical curve, a curve one of whose co["o]rdinates
        is a trigonometric function of the other.
  
     Trigonometrical function. See under Function.
  
     Trigonometrical lines, lines which are employed in solving
        the different cases of plane and spherical trigonometry,
        as sines, tangents, secants, and the like. These lines, or
        the lengths of them, are trigonometrical functions of the
        arcs and angles to which they belong.
  
     Trigonometrical survey. See under Survey.

  
  
     Note: Co["o]rdinates are of several kinds, consisting in some
           of the different cases, of the following elements,
           namely:
        (a) (Geom. of Two Dimensions) The abscissa and ordinate of
            any point, taken together; as the abscissa PY and
            ordinate PX of the point P (Fig. 2, referred to the
            co["o]rdinate axes AY and AX.
        (b) Any radius vector PA (Fig. 1), together with its angle
            of inclination to a fixed line, APX, by which any
            point A in the same plane is referred to that fixed
            line, and a fixed point in it, called the pole, P.
        (c) (Geom. of Three Dimensions) Any three lines, or
            distances, PB, PC, PD (Fig. 3), taken parallel to
            three co["o]rdinate axes, AX, AY, AZ, and measured
            from the corresponding co["o]rdinate fixed planes,
            YAZ, XAZ, XAY, to any point in space, P, whose
            position is thereby determined with respect to these
            planes and axes.
        (d) A radius vector, the angle which it makes with a fixed
            plane, and the angle which its projection on the plane
            makes with a fixed line line in the plane, by which
            means any point in space at the free extremity of the
            radius vector is referred to that fixed plane and
            fixed line, and a fixed point in that line, the pole
            of the radius vector.
  
     Cartesian co["o]rdinates. See under Cartesian.
  
     Geographical co["o]rdinates, the latitude and longitude of
        a place, by which its relative situation on the globe is
        known. The height of the above the sea level constitutes a
        third co["o]rdinate.
  
     Polar co["o]rdinates, co["o]rdinates made up of a radius
        vector and its angle of inclination to another line, or a
        line and plane; as those defined in
        (b) and
        (d) above.
  
     Rectangular co["o]rdinates, co["o]rdinates the axes of
        which intersect at right angles.
  
     Rectilinear co["o]rdinates, co["o]rdinates made up of right
        lines. Those defined in
        (a) and
        (c) above are called also Cartesian co["o]rdinates.
  
     Trigonometrical or Spherical co["o]rdinates, elements of
        reference, by means of which the position of a point on
        the surface of a sphere may be determined with respect to
        two great circles of the sphere.
  
     Trilinear co["o]rdinates, co["o]rdinates of a point in a
        plane, consisting of the three ratios which the three
        distances of the point from three fixed lines have one to
        another.

  trigonometrical
     a.
     Of, pertaining to, or obtained using trigonometry

  trigonometrical
     a.
     Of, pertaining to, or obtained using trigonometry

  trigonometrical
     a.
     Of, pertaining to, or obtained using trigonometry

  trigonometrical
     a.
     Of, pertaining to, or obtained using trigonometry

  Trigonometrical /tɹˌɪɡənəʊmˈɛtɹɪkəl/
  مثلثي

  trigonometrical /tɹˌɪɡənəʊmˈɛtɹɪkəl/ 
  trigonometrický

  trigonometrical /tɹˌɪɡənəʊmˈɛtɹɪkəl/ 
  trigonometregol 

  trigonometrical /tɹˌɪɡənəʊmˈɛtɹɪkəl/
  trigonometrisch  [math.]
     Synonym: trigonometric
  

  trigonometrical /tɹˌɪɡənəʊmˈɛtɹɪkəl/
  trigonometrijski

     a. 三角法的