The Cosine Rule

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A surveyor measures a triangular plot of land $L M N$ . The distance $LN\,$ is 4.8 m and $MN\,$ is 7.1 m. The angle at $N\,$ is $110∘110^\circ$ . The distance $LM\,$ is $y\,$ 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 $y$ . Give your answer to 3 significant figures.

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The Cosine Rule Questions

Practise OCR GCSE Maths The Cosine Rule with exam-style questions for Foundation and Higher tier. 44 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.