a rectangle...
boxes
A tent.
does a rectangle prism have 6 sides
Technically it is a rectangular prism.
a rectangle...
Rectangle dumby
A dollar bill is truly shaped like a rectangle.
The three faces of the prism may be, but are not necessarily, rectangles. It depends on how the ends of the prism are cut/shaped.
box,
Most people will, without hesitation, say a rectangle. In actual fact, though, the paper DOES have a thickness. If it did not, then a stack of dollar bills would still have no height. So, at a very fine level of detail, it is shaped like a rectangular prism.
boxes
A cookie jar is sometimes a pentagonal prism.
Rectangle prism
An octagonal prism is a geometric shape with eight faces that are octagons. Some common objects that are shaped like an octagonal prism include certain types of crystals, such as beryl or fluorite, as well as certain types of nuts and bolts. In architecture, some buildings may feature octagonal prism-shaped elements, such as towers or spires. Overall, objects shaped like an octagonal prism are typically characterized by their eight flat sides and two parallel, congruent octagonal bases.
A tent.
does a rectangle prism have 6 sides