# Diagonal

**DIAGONAL** , in geometry, a line joining the intersections of two pairs of sides of a rectilinear figure.

*Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)*

**DIAGONAL** , in geometry, a line joining the intersections of two pairs of sides of a rectilinear figure.

*Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)*