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2 definitions found
 for Exterior angle
From The Collaborative International Dictionary of English v.0.48 :

  Exterior \Ex*te"ri*or\, a. [L. exterior, compar. of exter or
     exterus on the outside, outward, foreign, strange, a compar.
     fr. ex: cf. F. ext['e]rieur. See Ex-, and cf. Extreme,
     1. External; outward; pertaining to that which is external;
        -- opposed to interior; as, the exterior part of a
        [1913 Webster]
              Sith nor the exterior nor the inward man
              Resemble that it was.                 --Shak.
        [1913 Webster]
     2. External; on the outside; without the limits of;
        extrinsic; as, an object exterior to a man, opposed to
        what is within, or in his mind.
        [1913 Webster]
              Without exterior help sustained.      --Milton.
        [1913 Webster]
     3. Relating to foreign nations; foreign; as, the exterior
        relations of a state or kingdom.
        [1913 Webster]
     Exterior angle (Geom.), the angle included between any side
        of a triangle or polygon and the prolongation of the
        adjacent side; also, an angle included between a line
        crossing two parallel lines and either of the latter on
        the outside.
     Exterior side (Fort.), the side of the polygon upon which a
        front of fortification is formed. --Wilhelm.
        [1913 Webster]
     Note: See Illust. of Ravelin.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

  exterior angle
      n 1: the supplement of an interior angle of a polygon [syn:
           exterior angle, external angle]

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