In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles.
Father of geometry
Proposition 32, Book I of 'Elements'
c. 300 BCE
Found in 1 providers: grok
Cross Reference
1 source
"The prime numbers are more than any assigned multitude of prime numbers."
Shocking"The postulates are not self-evident, but they are necessary for the development of geometry."
Strange & Unusual"What has been affirmed without proof can also be denied without proof."
Strange & Unusual"What do I gain by learning these things?"
Strange & Unusual"There are infinitely many prime numbers."
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