a triangular pyramid
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A polygonal pyramid.
A 2-dimensional figure. A 2-dimensional figure. A 2-dimensional figure. A 2-dimensional figure.
A triangular pyramid. This is one where all the faces are triangles - a three-sided base, from which three triangular faces rise to a single point - the apex.
triangular prism
They both have a triangle as a base They both have more than one triangular face