A pyramid
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A 5-sided 2-dimensional figure is a pentagon and a 5-sided 3-dimensional shape is a pentahedron.
Octahedron
In geometry a 29 sided shape is referred to as an icosikaidigon. The shape closely resembles an 3 dimensional octagon.
a polyhedron (if the shape is 3 dimensional) a polygon if it is a planar shape.
2 or 3 dimensional?