Trigonometry GCSE questions
SOHCAHTOA questions: pick sin, cos or tan from the sides you have, then find a side or an inverse angle.
Calculator
Degrees mode. Inverse sin is sin⁻¹, not 1/sin.
Practice questions
Cover the answers and have a go first. Worked solutions are underneath.
sin 30° = ?
Opposite 7, hypotenuse 25. sin θ = ?
θ = 30°, hypotenuse 12. Opposite side?
Opposite 5, adjacent 5. Angle θ?
Common mistakes
- Labelling opposite and adjacent the wrong way round.
- Radians mode left on.
Answers and working
Frequently asked questions
When do I use Pythagoras instead?
When you have two sides and need the third, and no angle other than 90° is involved.
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