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