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In triangle ABC we have \(\angle C = 3\angle A\), a=27 and c=48  What is b?

Note: a is the side length opposite A etc.

 

please help

 Aug 14, 2020
 #1
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By the cosine law, b = 35.

 Aug 15, 2020
 #2
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I used sine rule followed by trig identities to get the value of sin

Then I used cosine rule to find the answer.

It was not an easy question.

 

I did not check my working but I also got an approx answer of 35.001.

 Aug 15, 2020

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