A-level · Trigonometry

The sine and cosine rulesExam-style questions

Solving any (non-right-angled) triangle — the sine rule, the cosine rule and the area formula ½ab·sinC — and how to choose the right one from what you're given.

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15 questions · A-level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 2Level 3Level 4
  1. 1
    In triangle ABCABC, angle A=40∘A = 40^{\circ}, angle B=75∘B = 75^{\circ} and a=8a = 8 cm.

    Find bb, giving your answer to 33 significant figures. (3 marks)
    Level 2 · 3 marksTry it