Trigonometry revision

Trigonometry becomes much easier when students follow a consistent routine. The key is to identify the triangle, label the sides and choose the correct relationship.

Start with right-angled triangles

Students should be confident with sine, cosine and tangent before moving to more advanced trigonometry. SOHCAHTOA is useful, but only if the sides are labelled correctly.

Check calculator mode

For GCSE and IGCSE, calculators usually need to be in degrees. A wrong mode can make every answer wrong.

Move on to sine and cosine rules

Higher tier students may need the sine rule, cosine rule and area of a triangle. These work best when diagrams are clear.

Practise exam wording

Trigonometry questions often appear in bearings, 3D shapes and problem-solving contexts. Students need to practise recognising when trig is needed.

FAQs

What is the best way to revise trigonometry?

Use diagrams, label sides carefully and practise choosing the correct formula.

Why are my trig answers wrong?

Common causes include calculator mode, incorrect side labels and premature rounding.