Maths! Help with a question?! Watch

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#1
Report Thread starter 16 years ago
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Take a look at the attached file.. How do I work out the angles within the triangle from the sides given. I know sine and cosine rules but how can these be used here? I got the question off a past EDEXCEL Exam paper. Thanks in advance for your help, and good luck to everyone with exams this week!
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#2
Report 16 years ago
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im not the best at maths so this could be wrong but...

I think that you can use CosA = [b^2 + c^2 - a^2] / 2bc
to find the Cos of the angle. From that you can get the angle in degrees and (I think) you can simply re-label the sides and then repeat the operation to find the Cos's of all the angles.

If this is wrong please dont blame me (just trying to help out).
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