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.
Father of geometry
Found in 2 providers: deepseek,grok
Cross Reference
2 sources
"And the greater is a multiple of the less when it is measured by the less."
Shocking"If a straight line be cut in extreme and mean ratio, the greater segment is also cut in extreme and mean ratio by the lesser segment."
Shocking"To draw a straight line at right angles to a given straight line from a given point on it."
Strange & Unusual"If a straight line be drawn from the ends of a straight line, it will be a triangle."
Strange & Unusual"Let it be granted that a circle may be described with any center and any radius."
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