A pyramid is a three-dimensional figure with five verticies and five sides (four of which are triangles and one of which is a square).
A pentagon is a two-dimensional figure with five angles and five edges.
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Pyramid, but to be exact it would be a Triangular Pyramid ;) * * * * * To be exact ... but WRONG! A triangular pyramid has 4 faces and 4 vertices! A shape with 5 faces and vertices is a quadrilateral based pyramid - of which a special case would be a square based pyramid.
There is no shape with only four triangular faces and five vertices. If there is also a quadrilateral face then it is a quadrialteral based pyramid.
A triangular prism.
In geometry, a pentahedron is a polyhedron with five faces. That can either be a square pyramid with 5 vertices, 8 edges and 5 faces or a triangular prism with 6 vertices, 9 edges and 5 faces.
None. A shape with four faces is a tetrahedron and that has 4 vertices, not 6.