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The Sine Rule

The Sine Rule

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Genie and Baby Genie

Lesson

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8 minute activity

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Triangle ABC with angles A, B, C and opposite sides BC, AC, AB colour coded to show opposite pairs The sine rule is usually used in non-right-angled triangles and links each angle to the side directly opposite it. Before you substitute anything, identify the matching side-angle pairs.

In triangle ABCABCABC, side BCBCBC is opposite angle AAA, side ACACAC is opposite angle BBB, and side ABABAB is opposite angle CCC. If two angles are known, find the third first because A+B+C=180∘A + B + C = 180^\circA+B+C=180∘.

Questions

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36 exam-style questions

Practice questions

Question 1

3 marks

Work out the value of xxx. Give your answer to 1 decimal place.

The Sine Rule Revision Guide

  1. GCSE
  2. /Maths
  3. /The Sine Rule

Revision notes for AQA GCSE Maths The Sine Rule: explanations and worked examples.

Revision guides

Practise questions

1 of 5

In triangle ABCABCABC, AB=8AB=8AB=8 cm, angle A=50∘A=50^\circA=50∘ and angle B=70∘B=70^\circB=70∘. Which complete opposite pair can be used in the sine rule?