3-dimensional rectangle.
Cuboid.
Yes
A cereal box is a six sided rectangular polyhedron called a rectangular cuboid. Each of its faces has the shape of a rectangle.
a rectangle
A rectangular prism.
a rectangle a hexagon
By the shape...
a Rectangular Prisim
A box - for example a box of cereal
It varies widely, depending on the size of the box and the size and shape of the cereal pieces.
A wooden beamA brick (with the hollows filled) A paperback book A box (such as a cereal box) A matchbox A simple wardrobe
A rectangluar prisim as a 3 dimensional shape but a rectangle as a 2 dimensional shape.