At least three edges meet at a vertex (or corner) in a 3D shape.
A vertex is a point where edges of a shape intersect. In three-dimensional geometry, a vertex is typically formed where three or more faces, and therefore edges, meet. This is because two edges alone would just form a line segment and not a distinct corner.
For example:
- Cube: Each vertex has three edges meeting.
- Tetrahedron: Each vertex has three edges meeting.
- Pyramid (square base): The apex has four edges meeting, while vertices on the base have three edges meeting.
Therefore, the minimum number of edges that meet at a vertex is three.
