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Trigonometry Glossary

complement

(geometry) The difference between a right angle and the angle.
cosecant

(trig) The secant of the complement.
cosine

(trig) The sine of the complement.
cotangent

(trig) The tangent of the complement.
degree

(trig) A unit of measure for angles equal to 1/360 of a full circle.
gradian

(trig) A unit of measure for angles equal to 1/400 of a full circle.
hypotenuse

(geometry) The side opposite the right angle of a right-angled triangle.
minute

(trig) A unit of measure for angles equal to 1/60 of a degree.
radian

(trig) A unit of measure for angles; one radian is the angle subtended by an arc that has a curved length equal to the radius of the arc.
secant

(trig) Ratio of the hypotenuse to the adjacent side of a right-angled triangle
second

(trig) A unit of measure for angles equal to 1/60 of a minute,
sine

(trig) Ratio of the opposite side to the hypotenuse of a right-angled triangle
tangent

(trig) Ratio of the opposite side to the adjacent side of a right-angled triangle
trigonometry

The study of the metrics of triangles in particular and angular figures in general.
unit circle

A circle with a diameter of one.

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