obliquangle

plural obliquangles

1. obsoletegeometryObsolete form of oblique angle.

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

   1618, John Napier, translated by Edward Wright, A description of the admirable table of logarithmes, London: […] Simon Waterson, page 3

   3 more examples

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

   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

   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, […]

   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

   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, […]

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