Three edges meet at each vertex.
4
3
As many edges that its base has
They have 8 vertices, 12 edges and 6 faces. All edges meet at right angles. All faces meet at right angles. Every face is a rectangle (a square is a rectangle). The three vertex-to-opposite-vertex diagonals meet at a point which is the centre of gravity. This point bisects the diagonals.
A vertex can be the corner of a polyhedron in which case at least three edges meet at a vertex.
Three edges meet at each vertex.
Edges meet at a vertex.
4
3
As many edges that its base has
They have 8 vertices, 12 edges and 6 faces. All edges meet at right angles. All faces meet at right angles. Every face is a rectangle (a square is a rectangle). The three vertex-to-opposite-vertex diagonals meet at a point which is the centre of gravity. This point bisects the diagonals.
3
No. For example, a cube is a polyhedron and 3 edges meet at each vertex.
A vortex is an area of circular fluid flow in fluid dynamics and no edges meet there. A vertex is a corner of a geometric shape and there can be two or more edges meeting at a vertex. There is no upper limit to the number of edges.
vertex
Vertex .