The roof of a house,
Objects that are shaped like a diamond include certain gemstones such as diamonds and rhombus-shaped figures in geometry. In chemistry, the molecular structure of some compounds like methane and ethylene can also be described as diamond-shaped. Additionally, some playing cards, like diamonds in a deck of cards, are also shaped like a diamond.
There are no ordinary household objects shaped like a decagon. Some glasses or vases may be decagonal in shape.
There are few household objects that are shaped like nonagons. Some coins in a few countries are, but even these are rare designs.
Food shaped like a polygon
The roof of a house,
A tent.
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Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
Some things that are shaped like pyramids include the pyramids of Egypt, pyramidal structures in architecture, some mountains and hills, and certain crystals and geometric shapes.
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There are so many things which are shaped like a pyramid. Some of these things include the Pyramid Island in Nevada, earrings, cakes, hopscotch, chandeliers and so much more.
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A folded napkin is often folded into a right triangle. The corners of walls can be shaped like a right angle.
There are some Christmas gift stands that are shaped like rectangular pyramids.
An example of a dodecagon would be a semiregular tiling.There are many but some have dodecagons.
A rubick's cube, an icecube, dice, baby block, some boxes, 2x2 Lego pieces