If a straight line be drawn from the ends of a straight line, it will be a triangle.
Father of geometry
Paraphrased from implications within 'Elements', not a direct definition.
c. 300 BCE
Found in 1 providers: grok
Cross Reference
1 source
"A plane surface is a surface which lies evenly with the straight lines on itself."
Shocking"A figure is that which is contained by any boundary or boundaries."
Strange & Unusual"Sire, there is no royal road to geometry."
Shocking"A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line."
Strange & Unusual"The properties of figures are derived from their definitions and postulates."
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