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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.