# Geometry and trigonometry

```latex
c^2=a^2+b^2-2ab\cos\gamma
```

```latex
\frac{a}{\sin\alpha}=\frac{b}{\sin\beta}=\frac{c}{\sin\gamma}
```

```latex
A=\pi r^2 \qquad V=\frac{4}{3}\pi r^3
```