Geometry & MeasuresDeep Dive

Method

Part of Sine Rule · GCSE GCSE Mathematics revision

This deep dive covers Method within Sine Rule for GCSE Mathematics. Revise Sine Rule in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 3 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 3 of 5 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 5

Practice

12 questions

Recall

3 flashcards

Method

1 Label sides a, b, c opposite to angles A, B, C

2 Check you have a matched pair (side + opposite angle)

3 Set up the equation using only the two ratios you need

4 Cross-multiply and solve

Keep building this topic

Read this section alongside the surrounding pages in Sine Rule. That gives you the full topic sequence instead of a single isolated revision point.

The Sine Rule Worked Example: Finding a Side Beyond Right Angles Knowledge Organiser: The Sine Rule

Practice Questions for Sine Rule

Which of the following is the sine rule?

A. a/sinA = b/sinB = c/sinC
B. a² = b² + c² − 2bc cosA
C. Area = ½ab sinC
D. sinA/a = sinB/b + sinC/c

1 markfoundation

Explain what is meant by the ambiguous case of the sine rule, and state when it can occur.

3 markshigher

Quick Recall Flashcards

Sine Rule

a/sinA = b/sinB = c/sinC. Use when you have a matched pair (side with opposite angle).

Sine Rule

a/sin A = b/sin B = c/sin C

12 questions on Sine Rule — practise free

Instant marking, adaptive difficulty, and 3 spaced repetition flashcards. Free until your GCSEs.

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The Sine Rule

Worked Example: Finding a Side