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2 definitions found
 for plane figure
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 WordNet (r) 3.0 (2006) :

  plane figure
      n 1: a two-dimensional shape [syn: plane figure, two-
           dimensional figure]

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