\begin{definition}[Definition:Inscribe/Polygon in Circle]
A polygon is '''inscribed in''' a circle when each of its vertices lies on the circumference of the circle:
:300px
{{EuclidSaid}}
:''{{:Definition:Euclid's Definitions - Book IV/3 - Inscribed in Circle}}''
{{EuclidDefRefNocat|IV|3|Inscribed in Circle}}
\end{definition}