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
"No trace of Euclid's personality has survived."
Shocking"To draw a straight line at right angles to a given straight line from a given point on it."
Strange & Unusual"To produce a finite straight line continuously in a straight line."
Shocking"If a straight line touch a circle, and from the point of contact there be drawn across in the circle a straight line cutting the circle, the angles which it makes with the tangent will be equal to the…"
Strange & Unusual"A line is breadthless length."
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