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 4 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 4
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.)