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# Chapter 13 More Trigonometry

## 13.5 Calculating Areas and the Sine Rule

The sine rule for the area of a triangle is Area = Â½ ab sinC, where â€˜aâ€˜ and â€˜bâ€˜ are two sides of a triangle and â€˜Câ€˜ is the angle in between them. In this section, we learn about sine and cosine rules, sine rule, discussion of the sine rule in a general triangle, use the sine rule to find the missing side, use the sine rule to find the missing angle, area of triangle.

Chapter 13 More Trigonometry

## 13.6 The Cosine Rule and 2D Trigonometric Problems

The cosine rule a^2=b^2+c^2-2bccosA can be used in any triangle to calculate an unknown side. In this section, we learn about sine and cosine rules, cosine rule, arrange the cosine rule to find an angle, use the cosine rule to find the missing angle.

Chapter 13 More Trigonometry

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