To draw a straight line at right angles to a given straight line from a given point on it.
Father of geometry
Proposition 11, Book I of 'Elements' (a problem statement)
c. 300 BCE
Found in 1 providers: grok
Cross Reference
1 source
"A semicircle is the figure contained by the diameter and the circumference cut off by it. And the center of the semicircle is the same as that of the circle."
Strange & Unusual"If a number be the least that is measured by any prime numbers, it will not be measured by any other prime number except those originally measuring it."
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