# Definition:Geometric Figure/Rectilineal Figure

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## Definition

In the words of Euclid:

**Rectilineal figures**are those which are contained by straight lines,**trilateral**figures being those contained by three,**quadrilateral**those contained by four, and**multi-lateral**those contained by more than four straight lines.

(*The Elements*: Book $\text{I}$: Definition $19$)