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  2. Sum of angles of a triangle - Wikipedia

    en.wikipedia.org/wiki/Sum_of_angles_of_a_triangle

    Triangle postulate: The sum of the angles of a triangle is two right angles. Playfair's axiom: Given a straight line and a point not on the line, exactly one straight line may be drawn through the point parallel to the given line. Proclus' axiom: If a line intersects one of two parallel lines, it must intersect the other also. [3]

  3. Handshaking lemma - Wikipedia

    en.wikipedia.org/wiki/Handshaking_lemma

    Alternatively, it is possible to use mathematical induction to prove the degree sum formula, [2] or to prove directly that the number of odd-degree vertices is even, by removing one edge at a time from a given graph and using a case analysis on the degrees of its endpoints to determine the effect of this removal on the parity of the number of ...

  4. Fermat point - Wikipedia

    en.wikipedia.org/wiki/Fermat_point

    Fig 1. Construction of the first isogonic center, X(13). When no angle of the triangle exceeds 120°, this point is the Fermat point. In Euclidean geometry, the Fermat point of a triangle, also called the Torricelli point or Fermat–Torricelli point, is a point such that the sum of the three distances from each of the three vertices of the triangle to the point is the smallest possible [1] or ...

  5. Degree (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Degree_(graph_theory)

    The degree sum formula states that, given a graph = (,), ⁡ = | |. The formula implies that in any undirected graph, the number of vertices with odd degree is even. This statement (as well as the degree sum formula) is known as the handshaking lemma. The latter name comes from a popular mathematical problem, which is to prove that in any group ...

  6. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    Of all ellipses going through the triangle's vertices, it has the smallest area. [65] The Kiepert hyperbola is unique conic that passes through the triangle's three vertices, its centroid, and its circumcenter. [66] Of all triangles contained in a given convex polygon, one with maximal area can be found in linear time; its vertices may be ...

  7. Viviani's theorem - Wikipedia

    en.wikipedia.org/wiki/Viviani's_theorem

    For any interior point P, the sum of the lengths of the perpendiculars s + t + u equals the height of the equilateral triangle.. Viviani's theorem, named after Vincenzo Viviani, states that the sum of the shortest distances from any interior point to the sides of an equilateral triangle equals the length of the triangle's altitude. [1]

  8. Formula 1: Austrian Grand Prix finishing order gets shuffled ...

    www.aol.com/sports/formula-1-austrian-grand-prix...

    “Regarding the track limits infringements at the 2023 FIA Formula 1 Austrian Grand Prix, we note that due to the specifics of the circuit layout and the propensity of many drivers to repeatedly ...

  9. Angular defect - Wikipedia

    en.wikipedia.org/wiki/Angular_defect

    For a polyhedron, the defect at a vertex equals 2π minus the sum of all the angles at the vertex (all the faces at the vertex are included). If a polyhedron is convex, then the defect of each vertex is always positive. If the sum of the angles exceeds a full turn, as occurs in some vertices of many non-convex polyhedra, then the defect is ...