(geometry) An obtuse triangle.

(geometry) An acute triangle.

plural of right-angled triangle

plural of acute-angled triangle

plural of obtuse-angled triangle

(geometry) Half of the angle formed by a single straight line, equivalent to 90 degrees. / (mathematics) An ∟ character.

(geometry) An angle that, when added to another referenced angle, produces a right angle.

(geometry) plural of supplementary angle

(geometry) A pair of angles that sum to 180 degrees.

(geometry) plural of complementary angle