It's a Rectangle!
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Actually, as a 3-dimensional object, it is a rectangular prism or cuboid.
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Cuboid.
a rectangle a hexagon
a Rectangular Prisim
A wooden beamA brick (with the hollows filled) A paperback book A box (such as a cereal box) A matchbox A simple wardrobe
A prism has two parallel and congruent bases in the shape of polygons. Example - a cereal box (is rectangular prism). The top and bottom are rectangles(a polygon). They are the same size and shape (congruent) and also parallel. A cube (think of six sided dice) is a special rectangular prism. Imagine a a box where the top and bottom are triangles (of the shape size and shape). This is called a triangular prism.