Trigonometry

• SOH CAH TOA


  Trigonometry rules
• Steps to solve trigonometry problems

  1. Label your sides first, you'll need O, H and A

  2. Choose if you need SOH, CAH or TOA

  3. Cover the one you need with your thumb

  4. Write the equation

  5. Solve it, then you're done
• Triangle ABC


  • BC = 8.5 cm
  • Angle ABC = 38°
  • Angle ACB = 90°
• The diagram shows triangle ABC
• Dragan NOT accurately draws the diagram
• • Work out the length of AB
  • Give your answer correct to 3 significant figures