# Circular sector

**Arc length**

$$l=r{\alpha}_{\left[rad\right]}=\frac{r{\alpha}_{\left[\xb0\right]}\pi}{180\xb0}$$

## Sector Area

$$A=\frac{{r}^{2}{\alpha}_{\left[rad\right]}}{2}=\frac{{r}^{2}{\alpha}_{\left[\xb0\right]}\pi}{360\xb0}$$

Keywords: selctor,arc length, sector area