obtusangledとは 意味・読み方・使い方

形容詞

obtusangled (not comparable)

1. (geometry) Obsolete form of obtuse-angled.
   • 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 111:

     12 An obliquangled triangle is either Obtuſangled or Acutangled.
     The diviſion of an obliquangled triangle is taken from the ſpeciall differences of an oblique angle. For at the 15 e iij, we were taught that an oblique angle was either obtuſe or acute: Therefore an obliquangled triangle is an obtuſeangle, and an Acutangle.