\begin{definition}[Definition:Euclid's Definitions - Book IV/4 - Circumscribed about Circle]
{{EuclidSaid}}
:''A rectilineal figure is said to be '''circumscribed about a circle''', when each side of the circumscribed figure touches the circumference of the circle.''
{{EuclidDefRef|IV|4|Circumscribed about Circle}}
\end{definition}