The Maths Habit

The cosine rule

Trigonometry · Higher · 6:32

Worksheet (PDF) Answers (PDF)

Chapters

  1. 0:00Introduction
  2. 0:24Do Now
  3. 1:07The cosine rule
  4. 1:55Example 1: finding a side
  5. 2:40Example 2: finding an angle
  6. 3:28Sine rule or cosine rule?
  7. 4:03Your turn
  8. 4:42Common mistake
  9. 5:32Worksheet and exit question

Practise the cosine rule for 15 minutes a day in The Maths Habit, on your phone or in your browser.

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