A tent...
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.
A stop sign
a cloud (could vary)
Some objects that are shaped like an oval include eggs and footballs.
Yes, such a quadrilateral could be shaped like an arrow head - (a large V capping a smaller v).
A tent...
eggs
A sphere.
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.
it is equal shaped quadrilateral.
A pencil
Cuboids.
cone,spere
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