# Category:Perpendiculars

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This category contains results about **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.

(*The Elements*: Book $\text{I}$: Definition $10$)

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

## Subcategories

This category has the following 3 subcategories, out of 3 total.

## Pages in category "Perpendiculars"

The following 11 pages are in this category, out of 11 total.