Wiktionary
obtuse triangle
alt. (context geometry English) A triangle one of the angles of which is obtuse. n. (context geometry English) A triangle one of the angles of which is obtuse.
WordNet
obtuse triangle
n. a triangle that contains an obtuse interior angle [syn: obtuse-angled triangle]
Usage examples of "obtuse triangle".
This, the field of slaughter, comprised an obtuse triangle whose greatest depth lay along the southern flank, that which was anchored by the mountain wall.