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
"Let it be granted that a finite straight line may be produced to any length in a straight line."
Strange & Unusual"The extremities of a surface are lines."
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