obtuse vs rectangular

obtuse

adj
  • Obtuse-angled, having an obtuse angle. 

  • Blunt; not sharp, pointed, or acute in form. 

  • Intellectually dull or dim-witted. 

  • Blunt, or rounded at the extremity. 

  • Of sound, etc.: deadened, muffled, muted. 

  • Indirect or circuitous. 

  • Larger than one, and smaller than two right angles, or more than 90° and less than 180°. 

rectangular

adj
  • Having axes that meet each other with right angles. 

  • Having a shape like a rectangle. 

How often have the words obtuse and rectangular occurred in a corpus of books? (source: Google Ngram Viewer )