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 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.