A parallelogram ABCD ABCD\,ABCD has diagonal AC AC\,AC of length 8 cm. Given AB AB\,AB has length 5 cm, BC BC\,BC has length 5 cm and angle ABC ABC\,ABC is obtuse.
Find the size of angle ABC ABC\,ABC to 2 decimal places.
Find the area of the parallelogram ABCDABCDABCD.
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.