It is a closed 3-dimensional shape with five faces, each of which is a polygon. It could be a quadrilateral based pyramid or a triangular prismoid.
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it looks exactly like a square pyramid
there are 15 edges in a pentahedron
No. Pentahedron has 5 faces, and Cube has 6.
5, that is what the penta part of pentahedron means.
It has five faces in all. How many are lateral depends on the configuration of the pentahedron.