A vertex is the point where three or more edges of a solid figure meet.
a solid with flat sides meet at sharp edges and corners is called crystal structure
A vertex on a cube, for example, is where any three edges meet. On a pyramid (square type) it could be at the point on the top or the 4 bottom edges. :)
Yes. I think of an edge as a line. The edges meet at vertices, and the faces meet at edges.
It is a polyhedron.