A triangular metal brace has vertices LLL, MMM, and NNN. The side LN LN\,LN has a length of 12.5 cm, the side NM NM\,NM has a length of 9.2 cm, and the side LM LM\,LM has a length of 14.8 cm.
Work out the size of angle LNMLNMLNM.
Give your answer to 3 significant figures.
Practise AQA GCSE Maths The Cosine Rule with exam-style questions for Foundation and Higher tier. 44 questions, matched to the AQA GCSE Maths (8300) 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.