### The Cosine Law

Sometimes the Sine Law wont work, such as when the given information is one of these two cases:

- side-side-side (SSS)
- side-angle-side (SAS)

That's when we use the Cosine Law. You only need to use it once. After that you'll have enough inforamtion to use the Sine Law; which is much easier to use (less algebra). Watch this to see how the sides and angles in any non-right triangle are related.

Here you can review the sine law, watch a few animations of how it works and try a brief quiz (3 questions). You can try another quiz (5 questions) over there.

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