In the triangle ABCABCABC, AB=13cmAB = 13\text{cm}AB=13cm, BC=10cmBC = 10\text{cm}BC=10cm and angle BAC=30∘BAC = 30^\circBAC=30∘
Verify that the two possible sizes of angle ABCABCABC, to two decimal places, are 10.54∘ 10.54^\circ\,10.54∘ and 109.46∘109.46^\circ109.46∘.
217 exam-style questions on Edexcel A Level Maths Trigonometric Ratios, covering 9.1 The Cosine Rule, 9.2 The Sine Rule, 9.3 Areas of Triangles, 9.4 Solving Triangle Problems, 9.5 Graphs of Sine, Cosine and Tangent, and 9.6 Transforming Trigonometric Graphs. Each one has a worked solution and a mark scheme showing where the marks go.