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Radians

Radian measure is arc length divided by radius.

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  • Angles

    An angle measures rotation between rays sharing an endpoint.

  • Tangent function

    Tangent is sine divided by cosine where cosine is nonzero.

  • Trigonometric identities

    Trigonometric identities hold throughout their common domains, unlike equations requiring selected solutions.

  • Unit circle

    The unit circle relates an angle to cosine and sine coordinates.

  • Angle addition formulas

    Addition formulas express trigonometric functions of summed angles using individual angles.

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Trigonometry

Explore angles and the unit circle; identities and equations; triangles and oscillations. Concepts and connections are available independently of video coverage.

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