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An octahedron formed by joining together (base-to-base) two square-based pyramids.
15 faces on three
Octahedron. It is two square pyramids that share a base (Imagine a pyramid from Egypt, flip it upside down, and stick that to the bottom of the original pyramid).
False. In fact, the opposite is true: all pyramids have an even number of edges.
it has a number of faces, vertex and edges -- The angles are not all the same