Use SOHCAHTOA
- Label opposite, adjacent and hypotenuse.
- Choose sin, cos or tan.
- Substitute and solve.
Answer: tan ฮธ = opposite รท adjacent
๐ Geometry & Measures
Trigonometry
Learn trigonometry with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Trigonometry is part of geometry and appears often in KS3โGCSE maths.
- SOHCAHTOA links right-triangle sides and angles.
- Use the worked model, help guide, interactive question and flashcards to practise trigonometry until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Trigonometry learning map
Understand the key idea โ follow the help guide โ practise a question โ check your method โ build speed with flashcards.
3. Help guide
How to tackle Trigonometry
- Learn the rule: SOHCAHTOA links right-triangle sides and angles.
- Worked model: Label opposite, adjacent and hypotenuse. Choose sin, cos or tan. Substitute and solve.
- Try the interactive question without looking at the answer first.
- Use the flashcards to test the rule, the method and a common check.
4. Worked examples
Step-by-step working
5. Interactive questions
Try it yourself
In a right triangle, opposite = 3 and hypotenuse = 6. Find sin ฮธ.
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Trigonometry
BackSOHCAHTOA links right-triangle sides and angles.
FrontExample answer: In a right triangle, opposite = 3 and hypotenuse = 6. Find sin ฮธ.
Backsin ฮธ = 3 รท 6 = 1/2.
FrontCommon check for Trigonometry
BackCheck units/notation, compare with an estimate, and make sure the answer matches the question.
7. Finish
Complete this topic
When you have read the examples, tried the question and reviewed flashcards, claim your topic completion XP.