Sum of angles of a triangle to zero. For a spherical triangle, the sum of the angles is greater than 180° and can be up to 540°. Specifically, the sum of the angles is where "f" is the fraction of the sphere's area which is enclosed by the triangle. Note that spherical geometry does not satisfy several of Euclid's axioms (including the parallel postulate.) Angles between adjacent sides of a triangle are referred to as "interior" angles in Euclidean and other geometries. "Exterior" angles can be also defined, and the Euclidean triangle postulate can be formulated as the exterior angle theorem. One can also consider the
Victims of Terrorist Attack on the Pentagon Memorial Victims of Terrorist Attack on the Pentagon Memorial The Victims of Terrorist Attack on the Pentagon Memorial is a memorial over a group burial site at Arlington National Cemetery in the United States. It commemorates the victims of the Pentagon, which was struck by al-Qaeda terrorists as part of the September 11 attacks. The memorial specifically honors the five individuals for whom no identifiable remains were found. However, a portion of the remains of 25 other victims are buried at the site. The names of the 115 Pentagon employees and 10 contractors in the building, as well as the 53