- General
- es diagonal
- eu diagonal
- fr diagonale

### diagonal

- ca diagonal
*f* - de Kreuzungsstrasse
*f* - es diagonal
*f* - eu diagonal
- fr diagonale
*f* - gl diagonal
*f* - it diagonale
*f* - pt diagnóstico
*m*

### diagonal

### Diagonal

In geometry, a **diagonal** is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge. Informally, any sloping line is called diagonal. The word *diagonal* derives from the ancient Greek διαγώνιος *diagonios*,^{[1]} "from angle to angle" (from διά- *dia-*, "through", "across" and γωνία *gonia*, "angle", related to *gony* "knee"); it was used by both Strabo^{[2]} and Euclid^{[3]} to refer to a line connecting two vertices of a rhombus or cuboid,^{[4]} and later adopted into Latin as *diagonus* ("slanting line").

In matrix algebra, the diagonal of a square matrix consists of the entries on the line from the top left corner to the bottom right corner. There are also many other non-mathematical uses.

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