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Basic trigonometric ratios : Example: The six trig ratios

By: Sal Khan

Worked example where we walk through finding the major trig ratios

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Graphs of trig functions : Example: Graph of cosine

By: Sal Khan, Monterey Institute for Technology and Education

Basic interpretation of the graph of the cosine function

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Radians : Radians and degrees

By: Sal Khan

What a radian is. Converting radians to degrees and vice versa.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Inverse trig functions : Inverse Trig Functions: Arcsin

By: Sal Khan

Introduction to the inverse trig function arcsin

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Long live Tau : Tau versus Pi

By: Sal Khan

Why Tau might be a better number to look at than Pi

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Unit circle definition of trigonometric functions : Example: The s...

By: Sal Khan

Using the unit circle definition to think out the sin and cosine of a negative angle.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Graphs of trig functions : Graphing trig functions

By: Sal Khan

Analyzing the amplitude and periods of the sine and cosine functions.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Basic trigonometric ratios : Using Trig Functions

By: Sal Khan

Using Trigonometric functions to solve the sides of a right triangle

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Unit circle definition of trigonometric functions : Example: Using...

By: Sal Khan, Monterey Institute for Technology and Education

Worked example using our knowledge of 30-60-90 triangles and similarity to evaluate tan, cos and sin.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Long live Tau : Pi Is (still) Wrong.

By: Sal Khan

Please excuse the simple math and spelling errors. You shouldn't believe anything I say without double-checking even at the best of times.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Basic trigonometric ratios : Example: Solving a 30-60-90 triangle

By: Sal Khan, Monterey Institute for Technology and Education

This worked example can be done without trigonometry, but we do show how knowledge of 30-60-90 triangles can be helpful when evaluating trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Graphs of trig functions : Example: Figure out the trig function

By: Sal Khan, Monterey Institute for Technology and Education

Determining a trig function given its graph

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Basic trigonometric ratios : Basic Trigonometry II

By: Sal Khan

A few more examples using SOH CAH TOA

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Basic trigonometric ratios : Example: Using trig to solve for miss...

By: Sal Khan, Monterey Institute for Technology and Education

Worked example using trig ratios to solve for missing information and evaluate other trig ratios

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Basic trigonometric ratios : Example: Calculator to evaluate a tri...

By: Sal Khan, Monterey Institute for Technology and Education

Worked example showing how to use typical calculators to evaluate trigonometric functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Unit circle definition of trigonometric functions : Ferris Wheel T...

By: Sal Khan

Trigonometry problems dealing with the height of two people on a ferris wheen

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Unit circle definition of trigonometric functions : Example: Unit ...

By: Sal Khan, Monterey Institute for Technology and Education

Unit circle definition to calculate sin and cos of multiple angles

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Unit circle definition of trigonometric functions : Unit Circle Ma...

By: Sal Khan

Walk-through of the Khan Academy Unit Circle Manipulative.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Graphs of trig functions : Graphs of trig functions

By: Sal Khan

Exploring the graphs of trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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Radians : Example: Converting radians to degrees

By: Sal Khan, Monterey Institute for Technology and Education

Worked example showing how to convert radians to degrees

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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