Sire, there is no royal road to geometry.
Father of geometry
Reply to King Ptolemy I Soter who asked if there was a shorter way to learn geometry than through his 'Elements'.
c. 300 BCE
Found in 3 providers: gemini,grok,deepseek
Cross Reference
3 sources
"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 …"
Strange & Unusual"A figure is that which is contained by any boundary or boundaries."
Strange & Unusual"If two triangles have two sides equal to two sides respectively, and have the angles contained by the equal straight lines equal, they will also have the base equal to the base, the triangle will be e…"
Strange & Unusual"Things which are equal to the same thing are also equal to one another."
Strange & Unusual"And when the lines containing the angle are straight, the angle is called rectilineal."
Shocking