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English citations of obtuse

  1. (geometry) Of an angle: greater than 90 degrees but less than 180 degrees.
    • 1877, Ch[arles] Couche; James N. Shoolbred, transl., “Special Points in the Permanent Way”, in Permanent Way Rolling Stock and Technical Working of Railways. Followed by an Appendix on Works of Art, volume I, London: Dulau & Co., 37, Soho Square; Paris: Dunod, 49, Quai des Augustins, OCLC 58932800, § XIV (Rail-crossings), paragraph 258, page 316:
      Obtuse angles of the through crossing. — The system of the two obtuse-angled points is especially termed the dead-crossing. [] The point itself, less liable to damage than that of the crossing proper, on account of its obtuse form and its position relatively to the wheels, acts the same part towards the tapered portion of the cut rail, as the wing-rail does with respect to the acute-angle of the crossing.  [] Here also measures must be taken, less to protect the obtuse-angled points B, B′, towards which the wheels are not travelling directly, than to prevent the possible consequences which might ensue from a local widening of the line; namely concussions of the flanges against the tapering rail-ends, and even running off the line. A pair of wheels, travelling on the line MN, in the direction of the arrow finds it widened out, 1st on the right hand, on reaching the point ν; and 2nd on the left, after passing the obtuse point B′.
    • 1922, May Sinclair, “Space, Time and Other Consciousnesses”, in The New Idealism, New York, N.Y.: The Macmillan Company, OCLC 558287, section v, pages 255–256:
      If he is standing close beside me I know that our separate axes of vision will meet at an acute angle in the centre of his object, and if we are further apart, at an obtuser angle.
    • 1950, Nell Bevel Causey, “Variations in the Gonopods of a Xystodesmid Diplopod”, in The American Midland Naturalist, v 44, Notre Dame, Indiana: University of Notre Dame, pp 199–201:
      The curve of the main blade, which occurs about one-quarter of the distance from the tip, varied from a right angle to a widely obtuse angle. In clutch 178 the angle was obtuse in all specimens. In the other clutch, 190, it varied between right and widely obtuse.
    • 2002, Ing. N. Rajagopalan, Prestressed Concrete, Pangbourne UK: CRC Press, →ISBN, p 471:
      • Longitudinal bending of skew slab bridge decks is primarily between the obtuse angled corners for a definite band width. • At free edge maximum moment also occurs nearer to the obtuse corner rather than at centre.
    • 2003, Jerome Kaplan, New York State Coach: Mathematics, Standard-Based Practice, Grade 7, Coach Books, p 55:
      Two angles appear to be acute and one angle appears to be obtuse.