Trigonometry is a branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees (right triangles).

Triangles on a sphere are also studied, in spherical trigonometry.

Trigonometry specifically deals with the relationships between the sides and the angles of triangles, that is, the trigonometric functions, and with calculations based on these functions. Trigonometry has important applications in many branches of pure mathematics as well as of applied mathematics and, consequently, much of science and precalculus.

For example, the robotic arm on the International Space Station is operated by controlling the angles of its joints.

Calculating the final position of the astronaut at the end of the arm requires repeated use of the trigonometric functions of those angles..

For more information about the topic Trigonometry, read the full article at Wikipedia.org, or see the following related articles:

Triangle — A triangle is one of the basic shapes of geometry: a polygon with three vertices and three sides which are straight line segments. Any three ...  > read more

Hypotenuse of a right triangle — The hypotenuse of a right triangle is the triangle's longest side; the side opposite the right angle. The length of the hypotenuse of a right ...  > read more

Angle — An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. Angles provide a means of expressing the ...  > read more

Antiprism — An n-sided antiprism is a polyhedron composed of two parallel copies of some particular n-sided polygon, connected by an alternating band of ...  > read more

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