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
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.
Practice questions for Sine Rule
Which of the following is the sine rule?
Explain what is meant by the ambiguous case of the sine rule, and state when it can occur.
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