Look at the figure at right and answer the following:

Name the diagonals of the cuboid $ABCDEFGH$.

Look at the figure at right and answer the following:

Let $EFGH$ be the base, then name the four lateral faces.

Look at the figure at right and answer the following:

Let $EFGH$ be the base, then name the line segment which can be considered as the height of the cuboid.

How many vertices and edges do the following figure have?

How many vertices and edges do the following figures have?

Verify Euler's formula after counting the total number of vertices, edges and faces in the figure given at right.