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    Main content

    Trigonometry

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    Table of contents
    Mission

    Topics

    Trigonometry with right triangles
    Trigonometry with general triangles
    The unit circle definition of sine, cosine, and tangent
    Graphs of trigonometric functions
    Trigonometric equations and identities
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    Staff picks

    Article
    Sides of right triangles
    Introduction to the trigonometric ratios
    6:32
    Proof of the law of sines
    The law of sines
    9:04
    Unit circle definition of trig functions
    The unit circle definition of sine, cosine, and tangent
    Exercise
    Solve for a side in right triangles
    Solving for a side in a right triangle using the trigonometric ratios
    9:22
    Graph of y=sin(x)
    The graphs of sine, cosine, and tangent

    Get Started

    Introduction to the trigonometric ratios
    Meet your new best friends: sine, cosine, and tangent.
    Start Learning
    Table of contents