acute angle
Mathematical term for an angle less than 90 degrees. Often contrasted with 鈍角 (obtuse angle).
See also: 鈍角
三角形の内角の一つが鋭角である。
One of the interior angles of the triangle is an acute angle.
鋭角と鈍角の違いを説明してください。
Please explain the difference between an acute angle and an obtuse angle.
These two lines form an acute angle.
The two roads intersect at an acute angle.