Discussion
A solid with polygonal base and vertex is a
Answer: B
A solid whose base is a polygon and whose faces are triangles meeting at a single apex is a pyramid.
The base may be any polygon - triangular (a tetrahedron), square, pentagonal and so on - and the name of the pyramid follows the base.
A cone is the analogous solid built on a circular base, so a curved base rules the shape out of this definition.
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