Three edges meet at each vertex.
A vortex is a form of rotating fluid flow: for example a whirlpool. A vertex, on the other hand, is a point where lines meet. There can be two or more lines meeting at a vertex: there is no limit to how many. For example, the apex of a pyramid whose base is a polygon with n-sides, will be a vertex where n edges meet (for any integer n).
4
Three.
3
Three edges meet at each vertex.
A vortex is a form of rotating fluid flow: for example a whirlpool. A vertex, on the other hand, is a point where lines meet. There can be two or more lines meeting at a vertex: there is no limit to how many. For example, the apex of a pyramid whose base is a polygon with n-sides, will be a vertex where n edges meet (for any integer n).
3
4
Three.
3
3
Edges: 2, Vertex: None.
10 5 on the bottom and one for each vertex of the base connected to the vertex.
A triangular pyramid has 4 vertices (each vertex has 3 edges connected to it).
A vertex can be the corner of a polyhedron in which case at least three edges meet at a vertex.
Each of the 12 edges of a cube is directly perpendicular to four others (two at each vertex for that edge).