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A gradian, or gon, is one-hundredth of a right angle, or 100 degrees. It is used in surveying, mining and geology, and has the symbol ᵍ or ᵍ.
A radian is the SI unit of angle, defined as the angle subtended by an arc of length equal to the radius of a circle. Learn how to use radians in mathematics and science, how to convert them to degrees and other units, and how to avoid confusion with the symbol rad.
A degree is a unit of angle measurement, usually denoted by °, that represents one 360th part of a full rotation. Learn about the origin, usage and conversions of degrees, as well as the alternative units of radians and gons.
An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. Learn about different types of angles, such as acute, right, obtuse, straight, reflex and full angles, and how to measure and compare them.
Learn about various units of measurement that are not part of a coherent system, such as centimorgan, rack unit, or hand. Find out their definitions, examples, and origins from this Wikipedia article.
Learn about the equalities that involve trigonometric functions and are true for every value of the variables. Find the Pythagorean, reciprocal, reflection, shift, periodicity, angle sum and difference, and Ptolemy identities with examples and proofs.
Learn how to define and use trigonometric functions, such as tangent, in terms of right triangles, unit circle, and complex numbers. Explore the identities, graphs, and applications of trigonometric functions in geometry, calculus, and physics.
An overview of trigonometry, a branch of mathematics that studies the relationships between angles and sides in triangles. Learn about the history, functions, identities, applications, and fields of trigonometry.