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  2. Base (geometry) - Wikipedia

    en.wikipedia.org/wiki/Base_(geometry)

    The third vertex opposite the base is called the apex. The extended base of a triangle (a particular case of an extended side ) is the line that contains the base. When the triangle is obtuse and the base is chosen to be one of the sides adjacent to the obtuse angle , then the altitude dropped perpendicularly from the apex to the base ...

  3. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    The edges of a circular triangle may be either convex (bending outward) or concave (bending inward). [c] The intersection of three disks forms a circular triangle whose sides are all convex. An example of a circular triangle with three convex edges is a Reuleaux triangle, which can be made

  4. List of centroids - Wikipedia

    en.wikipedia.org/wiki/List_of_centroids

    The following is a list of centroids of various two-dimensional and three-dimensional objects. The centroid of an object in -dimensional space is the intersection of all hyperplanes that divide into two parts of equal moment about the hyperplane.

  5. Graph (discrete mathematics) - Wikipedia

    en.wikipedia.org/wiki/Graph_(discrete_mathematics)

    A graph with three vertices and three edges. A graph (sometimes called an undirected graph to distinguish it from a directed graph, or a simple graph to distinguish it from a multigraph) [4] [5] is a pair G = (V, E), where V is a set whose elements are called vertices (singular: vertex), and E is a set of unordered pairs {,} of vertices, whose elements are called edges (sometimes links or lines).

  6. Pyramid (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pyramid_(geometry)

    The base regularity of a pyramid's base may be classified based on the type of polygon: one example is the star pyramid in which its base is the regular star polygon. [28] The truncated pyramid is a pyramid cut off by a plane; if the truncation plane is parallel to the base of a pyramid, it is called a frustum.

  7. Edge (geometry) - Wikipedia

    en.wikipedia.org/wiki/Edge_(geometry)

    In geometry, an edge is a particular type of line segment joining two vertices in a polygon, polyhedron, or higher-dimensional polytope. [1] In a polygon, an edge is a line segment on the boundary, [2] and is often called a polygon side. In a polyhedron or more generally a polytope, an edge is a line segment where two faces (or polyhedron sides ...

  8. Graph of groups - Wikipedia

    en.wikipedia.org/wiki/Graph_of_groups

    Let T be a spanning tree for Y and define the fundamental group Γ to be the group generated by the vertex groups G x and elements y for each edge of Y with the following relations: y = y −1 if y is the edge y with the reverse orientation. y φ y,0 (x) y −1 = φ y,1 (x) for all x in G y. y = 1 if y is an edge in T. This definition is ...

  9. Mixed graph - Wikipedia

    en.wikipedia.org/wiki/Mixed_graph

    For the purpose of our example we will not be considering loops or multiple edges of mixed graphs. A walk in a mixed graph is a sequence ,,,,, …,, of vertices and edges/arcs such that for every index , either = + is an edge of the graph or = + is an arc of the graph.

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