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
Ministry of the Interior (Estonia) Ministry of the Interior (Estonia) The Ministry of the Interior of Estonia () is a Ministry in the Estonian Government. The current Minister of the Interior is Andres Anvelt. In 2018, Estonia’s ministry of interior plans to introduce the world’s first digital nomad visa in accordance to celebrating its 100 years of independence. The purpose of this visa is to allow non-Estonians access to Estonian services from abroad. This is an addition to groundbreaking initiatives like e-residency and border-less banking which has listed the country as one of the most digitally advanced nations of the decade. List of ministers of