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Year 9 · Term 1–2

9.3 Right-angle Trigonometry

Learning Objectives

Trigonometric Ratios

  1. 1. Identify and name the sides of a right-angled triangle (opposite, adjacent, hypotenuse).
  2. 2. Define the sine, cosine and tangent ratios (SOH CAH TOA).
  3. 3. Use trigonometric ratios to find a missing side in a right-angled triangle.
  4. 4. Use inverse trigonometric ratios to find a missing angle in a right-angled triangle.
  5. 5. Use exact values of sin, cos and tan at 30°, 45° and 60°.
  6. 6. Apply right-angle trigonometry to angles of elevation and depression.
  7. 7. Apply right-angle trigonometry to problems set inside 3D solids.