Thus, that the three angles of a triangle are quite equal to two right ones is a truth as certain as anything can be, and I think more evident than many of those propositions that go for principles;
Horrela, triangelu baten hiru angeluek zuzen biren balioa dutela beste edozeren adinako egia da, eta, ene ustez, printzipiotzat dauden proposizio horietako asko baino nabariagoa;