How about a cone or maybe a pyramid
How about a cone or a pyramid
Cone
A cone has a round base and a narrowing round top. I hope this answers your question!
pyramid or cone
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How about a cone or a pyramid
a pyramid
Such a figure is a pyramid.
A 3D shape with one base and three faces can only have triangular faces.
Cone
Pyramid
A polygonal pyramid.
The solid figure you're describing is a cylinder. It has two circular bases, but if we consider a cylinder without its bases, it consists of a single curved surface wrapping around the height of the cylinder. Another example of a solid figure with one curved surface and no bases is a cone if we only consider the curved part without the base.
a polygonal prism or a polygond
The sphere.
triangular prism
A cone, possibly.