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Unit Circle

Explore UnitCircle on MathWorld


The unit circle is a circle of radius one.

Unit circle is a high school-level concept that would be first encountered in a trigonometry course.

Prerequisites

Circle: A circle is the set of points in a plane that are equidistant from a given center point.

Classroom Articles on Trigonometry (Up to High School Level)

  • Cosine
  • Sine
  • Double-Angle Formulas
  • Tangent
  • Half-Angle Formulas
  • Trigonometric Addition Formulas
  • Law of Cosines
  • Trigonometry
  • Law of Sines