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.
Some examples of V-shaped valleys include Yosemite Valley in California, Cheddar Gorge in England, and Wachau Valley in Austria. These valleys are characterized by steep, narrow walls and a narrow channel at the bottom, typically created by the erosive force of a river or glacier over time.
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