Here are some lesson notes that I used to introduce my Y10 to the Cosine Rule. Suitable for GCSE Higher level students:
Homework on Cosine Rule – finding missing sides:
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GCSE Higher Level Questions on Sine and Cosine Rules – six questions taken from AQA exams that nicely test a pupil’s ability to apply the rules to worded, real-life questions. Presented as a pdf to display to the class question by question: