Quotes · Quote card
Quotation from Elements, Book I by Euclid
“the sum of the three internal angles is equal to two right angles.”
Elements, Book I, Book I, Prop. XXXII, trans. John Casey
The conclusion of Proposition 32, which rests on the theory of parallels.
Citation: "the sum of the three internal angles is equal to two right angles." — Euclid, Elements, Book I, Book I, Prop. XXXII, trans. John Casey. (id euclid-elements-book-i-q6)
Portrait: Euclidi Megaren (Euclide) - Studiolo di Federico da Montefeltro, Justus van Gent / Pedro Berruguete, Public domain.
