A triangle is shown with side lengths 15 cm, 16 cm, and 20 cm. The angle between the 15 cm and 16 cm sides is labeled x∘x^\circx∘.
Work out the value of xxx.
Give your answer to 3 significant figures.
The Cosine Rule Questions
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.