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The Sine Rule
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Opposite pairs

Opposite pairs

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.

The Sine Rule Lesson

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

Step-by-step lessons on CCEA GCSE Maths The Sine Rule. Each one builds up to exam-style questions. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.