If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the same side equal to two right angles.
Father of geometry
Proposition 29, Book I of 'Elements'
c. 300 BCE
Found in 1 providers: grok
Cross Reference
1 source
"Sire, there is no royal road to geometry."
Shocking"If a straight line be drawn from the ends of a straight line, it will be a triangle."
Strange & Unusual"A prime number is that which is measured by a unit alone."
Strange & Unusual"The square on the side subtending the right angle in right-angled triangles is equal to the squares on the sides containing the right angle."
Shocking"A plane angle is the inclination of the lines to one another, when two lines meet one another, but are not in the same straight line."
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