They're not always. But anytime something is not a pyramid shape, it's not called a pyramid,
it's called something else. So everything that's left ... all the things that are a pyramid shape ...
is called a pyramid.
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a pyramid
The shape of its base. So you can get triangular pyramids, square pyramids and so on.
no not all pyramids are polyhedron because each pyramid has a different shape. so no each pyramid is not a polyhedron * * * * * Yes they are.
It depends. A pyramid is a basic shape if you are reffering to the pyramids like the ones in Giza, Egypt those would be a square-based pyramid.
triangle... because pyramids are triangular therefore triangular pyramids have triangle faces