Edges - An edge is where two faces meet. For example a cube has 12 edges. Vertices - A vertex is a corner where edges meet (the plural is vertices). For example a cube has 8 vertices. 2D shapes ...

Then the judge writes 12 under edges, and the corners of the cube are highlighted next and 8 recorded under vertices. NARRATOR: Edges - that's twelve. Right, what about corners, or vertices - that ...