obtuse angle
A geometric term for an angle greater than 90 degrees and less than 180 degrees. Often contrasted with 鋭角 (acute angle).
See also: 鋭角
When one angle of a triangle is an obtuse angle, the triangle is called an obtuse triangle.
鋭角 is an angle less than 90 degrees, while 鈍角 is an angle greater than 90 degrees but less than 180 degrees.
鈍角 is an angle larger than 90 degrees, in contrast to 直角, which is exactly 90 degrees.
obtuse triangle
From 鈍 (dull, obtuse) + 角 (angle). A straightforward Sino-Japanese compound.