Typical soup cans, soda cans.
Garbage bins with metal lids
Anything with a flat, circular top and bottom with a rounded face between those.
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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.
Food shaped like a polygon
There are few household objects that are shaped like nonagons. Some coins in a few countries are, but even these are rare designs.