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2 definitions found
 for Plane trigonometry
From The Collaborative International Dictionary of English v.0.48 :

  Plane \Plane\, a. [L. planus: cf. F. plan. See Plan, a.]
     Without elevations or depressions; even; level; flat; lying
     in, or constituting, a plane; as, a plane surface.
     [1913 Webster]
  
     Note: In science, this word (instead of plain) is almost
           exclusively used to designate a flat or level surface.
           [1913 Webster]
  
     Plane angle, the angle included between two straight lines
        in a plane.
  
     Plane chart, Plane curve. See under Chart and Curve.
        
  
     Plane figure, a figure all points of which lie in the same
        plane. If bounded by straight lines it is a rectilinear
        plane figure, if by curved lines it is a curvilinear plane
        figure.
  
     Plane geometry, that part of geometry which treats of the
        relations and properties of plane figures.
  
     Plane problem, a problem which can be solved geometrically
        by the aid of the right line and circle only.
  
     Plane sailing (Naut.), the method of computing a ship's
        place and course on the supposition that the earth's
        surface is a plane.
  
     Plane scale (Naut.), a scale for the use of navigators, on
        which are graduated chords, sines, tangents, secants,
        rhumbs, geographical miles, etc.
  
     Plane surveying, surveying in which the curvature of the
        earth is disregarded; ordinary field and topographical
        surveying of tracts of moderate extent.
  
     Plane table, an instrument used for plotting the lines of a
        survey on paper in the field.
  
     Plane trigonometry, the branch of trigonometry in which its
        principles are applied to plane triangles.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Trigonometry \Trig`o*nom"e*try\, n.; pl. -tries. [Gr. ? a
     triangle + -metry: cf. F. trigonom['e]trie. See Trigon.]
     1. That branch of mathematics which treats of the relations
        of the sides and angles of triangles, which the methods of
        deducing from certain given parts other required parts,
        and also of the general relations which exist between the
        trigonometrical functions of arcs or angles.
        [1913 Webster]
  
     2. A treatise in this science.
        [1913 Webster]
  
     Analytical trigonometry, that branch of trigonometry which
        treats of the relations and properties of the
        trigonometrical functions.
  
     Plane trigonometry, and Spherical trigonometry, those
        branches of trigonometry in which its principles are
        applied to plane triangles and spherical triangles
        respectively.
        [1913 Webster]

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