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Tangent

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(1) In trigonometry, the tangent of an angle is the ratio of the length of a given angle's opposite side to the length of the angle's adjacent side in a right triangle. (2) In geometry, two figures are said to be tangent to one another if they "just touch".

Tangent is a high school-level concept that would be first encountered in a trigonometry course. It is listed in the California State Standards for Trigonometry.

Prerequisites

Right Triangle: A right triangle is a triangle that has a right angle. The Pythagorean Theorem is a relationship among the sides of a right triangle.
Trigonometry: Trigonometry is the study of angles and of the angular relationships of planar and three-dimensional figures.

Classroom Articles on Trigonometry (Up to High School Level)

  • Cosine
  • Law of Sines
  • Double-Angle Formulas
  • Sine
  • Half-Angle Formulas
  • Trigonometric Addition Formulas
  • Law of Cosines
  • Unit Circle