# 180/Historical Note

< 180
## Historical Note on $180$
There are $180 \degrees$ in a straight angle.
Thus the colloquial expression doing a $180$, meaning turning completely around (either literally or metaphorically) to face in the opposite direction, can be found in a variety of contexts.
$180 \fahr$ is the number of degrees Fahrenheit between the melting point ($32 \fahr$) and boiling point ($212 \fahr$) of water.