Worked Example: Finding a Side
Part of Sine Rule · GCSE GCSE Mathematics revision
This study notes covers Worked Example: Finding a Side 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 4 of 5 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 5
Practice
12 questions
Recall
3 flashcards
Worked Example: Finding a Side
In triangle ABC, A = 40°, B = 75°, and a = 8cm. Find b.
Solution
a/sin A = b/sin B
8/sin 40° = b/sin 75°
b = 8 × sin 75° / sin 40°
b = 8 × 0.966 / 0.643 = 12.0 cm (1 d.p.)
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.
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
12 questions on Sine Rule — practise free
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