Right triangles, non-right triangles and the art of not pressing random calculator buttons like a haunted squirrel.

Quick Summary

Trigonometry is about choosing the correct relationship between sides and angles.

• ✅ Must-know skills
• ⚠️ Common mistakes

First-Move Decision Flow

• Which method should I use?

Exam Practice

• Easy
• Medium
• Hard

Revision Checklist

• [ ] I check whether the triangle is right-angled first.
• [ ] I can label opposite, adjacent and hypotenuse.
• [ ] I can use inverse trig correctly.
• [ ] I know when to use sine rule vs cosine rule.
• [ ] My calculator is in degrees.