obliquangle

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obliquangle (plural obliquangles)

1. (geometry) Obsolete form of oblique angle.
   • 1618, John Napier, translated by Edward Wright, A description of the admirable table of logarithmes, London:   Simon Waterson, page 3:

     But if it be an obliquangle triangle, to note it with the letters BCD.

   • 1636, Peter Ramvs [i.e., Petrus Ramus], “Of Geometry, the ſeventh Booke, Of the compariſon of Triangles”, in William Bedvvell [i.e., William Bedwell], transl., Via Regia ad Geometriam: The VVay to Geometry,   Thomas Cotes,   Michael Sparke, page 100:

     Notwithſtanding in obliquangle triangles, although the ſhankes are not the heights, the caulſe of the truth hereof is the ſame.

   • 1645, Edmund Wingate, “The uſe of the Rule of Proportion in Geometrie” (chapter 5), in Edmund Wingate, transl., The uſe of the Rule of Proportion: in Arithmetique and Geometrie, London:   M. F. for P. Stephenss, Of Sphericall Obliquangle Triangles, page 59:

     IN an obliquangle Triangle, when the termes propounded are two ſides and one Angle , or two Angles and one ſide, and yet the terme required undiſcoverable by the two laſt premiſed Problemes, you are to convert ſuch a Triangle into two Rectangle Triangles, […]

   • 1650, John Wyberd, Tactometria. Seu, Tetagmenometria. Or the Geometry of Regulars practically proposed; ,   Robert Leybourn, for Nathaniel Brooks, pages 102-103:

     And here we may take in by the way, another kind of tetragonall Plane, very variable in reſpect of it's angles, but regular-like, (as I may term it) being equilaterall, though notequi-angular , called Rhombus, being the onely obliquangle equilaterall Parallelogram, and which therefore is a Quadrat, […]