# Category:Definitions/Perpendiculars

This category contains definitions related to Perpendiculars.
Related results can be found in Category:Perpendiculars.

In the words of Euclid:

When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.

In the above diagram, the line $CD$ has been constructed so as to be a perpendicular to the line $AB$.

## Pages in category "Definitions/Perpendiculars"

The following 13 pages are in this category, out of 13 total.