A rubick's cube, an icecube, dice, baby block, some boxes, 2x2 Lego pieces
A pyramid, possibly a roof, and tipi's. That's pretty much it......
Dice.
Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
Insects, screws and nails, tubing are some examples.
A natural made rock
A rubick's cube, an icecube, dice, baby block, some boxes, 2x2 Lego pieces
A pyramid, possibly a roof, and tipi's. That's pretty much it......
Some objects that are shaped like an oval include eggs and footballs.
A lot of common objects are cubes. These include dishwashers, microwaves, ovens and a lot more! * * * * * Many of these are rectangular prisms or cuboids, rather than cubes. But sugar cubes, dice are some examples.
Dice.
There are no ordinary household objects shaped like a decagon. Some glasses or vases may be decagonal in shape.
in scotland there is a v shaped valley
Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
There are few household objects that are shaped like nonagons. Some coins in a few countries are, but even these are rare designs.
Cube, pyramid, cone, cylinder.
A reversible object is an ice cube and a irreversible object is glass