When to use the Sine and Cosine Rules

Do you have a hard time remembering when to use the Law of Sines and Cosines (also called the Sine Rule and Cosine Rule)? Do you wonder how to use the Sine Rule and Cosine Rule or what information is needed when you want to use the Sine Rule and Cosine Rule?

Well, I've got you covered. In this video we'll look at which sides and angles you need to use the Law of Sines and Law of Cosines and we'll compare them side by side, so you have a better understanding of when you should use the Law of Sine and when you should use the Law of Cosines.

And as a bonus, we'll also give you that quick reminder that you shouldn't forget about right triangles and SohCahToa either. There's so much to remember. In this video we'll help you sort it out.

Did you miss our video on what the Sine Rule is? Check this out:

Did you miss our video on what the Cosine Rule is? Check this out:

Check out my YouTube channel "Like a Math Class"

#ibmath #LawOfSines #LawOfCosines #LikeAMathClass #IBMathTutor

This is part of Topic 3 - Geometry and Trigonometry of the IB Standard Level (SL) Analysis and Approaches curriculum.

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Legal Disclaimer: This video/channel is not affiliated with or sponsored by the International Baccalaureate. It is a channel based on my 10+ years of teaching IB SL Math. While I believe that with the right amount of time, effort and studying strategies, anyone has the potential to earn a 5 on their IB Math exam, individual results may vary.

[YoFarhaNBW]

For cosine rule you can say “angle sandwich” because the angle is in between the sides

[Ecea_]

How about if there are only two angles are given, is that possible to find the missing side?