Khan Academy on a Stick
Basic trigonometry
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Basic trigonometry
Introduction to trigonometry
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Example: Using soh cah toa
Worked example evaluating sine and cosine using soh cah toa definition.
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Basic trigonometry II
A few more examples using SOH CAH TOA
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Example: Trig to solve the sides and angles of a right triangle
Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.
Basic trigonometric ratios
In this tutorial, you will learn all the trigonometry that you are likely to remember in ten years (assuming you are a lazy non-curious, non-lifelong learner). But even in that non-ideal world where you forgot everything else, you'll be able to do more than you might expect with the concentrated knowledge you are about to get.
Similarity to define sine, cosine, and tangent
Sine and cosine of complements example
Showing relationship between cosine and sine of complements
Example with trig functions and ratios
Example relating trig function to side ratiosTrigonometric ratios and similarity
In this tutorial, we will build on our understanding of similarity to get a deeper appreciation for the motivation behind trigonometric ratios and relationships.
How much of a pyramid is submerged
Angle to aim to get alien
Figuring out coordinate of bended figure using trigTrig ratio application problems
You are now familiar with the basic trig ratios. We'll now use them to solve a whole bunch of real-world problems. Seriously, trig shows up a lot in the real-world.
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Secant (sec), cosecant (csc) and cotangent (cot) example
Worked example where we walk through finding the major trig ratios
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Example: Using trig to solve for missing information
Worked example using trig ratios to solve for missing information and evaluate other trig ratios
Reciprocal trig functions
You're now familiar with sine, cosine and tangent. Now you'll see that mathematicians have also defined functions that are the reciprocal of those: cosecant, secant and cotangent.