Euclid — "If a straight line be drawn from the ends of a straight line, it will be a trian…"
If a straight line be drawn from the ends of a straight line, it will be a triangle.
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Details
Paraphrased from implications within 'Elements', not a direct definition.
Date: c. 300 BCE
WisdomVerification
Unverifiable
Found in 1 providers: grok
1 source checked