A tetrahedron is a pyramid whose base is a

Name any four objects from your environment, which have the form of a cube.

Figure represents a cuboid. The lengths of the edges $AE, EF$ and $FG$ are indicated as $l, b$ and $h$ respectively. Indicate the lengths of all other edges.

In figure, if the face $EFGH$ is taken as the base, then name the lateral faces. Also, name the line segment representing the height of the cuboid.

In figure, name the four diagonals of the cuboid.

In the figure name the face parallel to $BFGC$.