Saccheri–Legendre theorem Saccheri–Legendre theorem In absolute geometry, the Saccheri–Legendre theorem states that the sum of the angles in a triangle is at most 180°. Absolute geometry is the geometry obtained from assuming all the axioms that lead to Euclidean geometry with the exception of the axiom that is equivalent to the parallel postulate of Euclid. The theorem is named after Giovanni Girolamo Saccheri and Adrien-Marie Legendre. The existence of at least one triangle with angle sum of 180 degrees in absolute geometry implies Euclid's parallel postulate. Similarly, the existence of at least one triangle with angle sum of less than 180 degrees
38 Degrees above a flat-line membership structure. 38 Degrees also claims its campaigns are selected by its members under its "Campaigns by You". David Babbs is Executive Director. He signs off some emails, appears in the media and frequently speaks at local 38 Degrees events. He has also represented 38 Degrees in front of parliamentary select committees. Babbs describes his motivation for campaigning as coming from "a gut feeling that things could be better, politically, socially, and environmentally and that the reason they’re not is largely due to the conscious actions of powerful people rather than due to bad luck or any