Lesson

3.2 NON-RIGHT ANGLED TRIGONOMETRY




After completing this section, you should be able to:

  • find area of triangles using sides and angles: \( A =\displaystyle \dfrac{1}{2}ab \sin C \)
  • find sides and angles using sine rule: \( \displaystyle \dfrac{a}{\sin A} = \dfrac{b}{\sin B} = \dfrac{c}{\sin C} \)
  • solve practical applications involving sine rule
  • find sides and angles using cosine rule: \( a^2 = b^2 + c^2 – 2bc \cos A \)
  • solve practical applications involving sine rule