Three buoys AAA, BBB, and C C\,C form a triangle. The distance AB=20AB = 20AB=20 nautical miles (nm), BC=25 nmBC = 25\text{ nm}BC=25 nm, and AC=35 nmAC = 35\text{ nm}AC=35 nm.
Work out the size of angle ABCABCABC.
Give your answer to the nearest degree.
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.