The Cosine Rule
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A surveyor measures a triangular plot of land LMNLMNLMN. The distance LN LN\,LN is 4.8 m and MN MN\,MN is 7.1 m. The angle at N N\,N is 110∘110^\circ110∘. The distance LM LM\,LM is y y\,y m.

Triangle LMN with side LN = 4.8 m, side MN = 7.1 m, obtuse angle N = 110 degrees, and side LM = y m.

Work out the value of yyy. Give your answer to 3 significant figures.

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The Cosine Rule Questions

Practise Edexcel GCSE Maths The Cosine Rule with exam-style questions for Foundation and Higher tier. 44 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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The Cosine Rule Questions

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