Category:Rectilineal Figures

This category contains results about Rectilineal Figures.
Definitions specific to this category can be found in Definitions/Rectilineal Figures.

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 $19$)