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An octahedron is the name for a non-specific shape. It could be a di-rectangular pyramid with 6 vertices - this is like two rectangular [or square] based pyramids stuck together base-to-base. Or it could be a heptagonal pyramid, in which case it has 8 vertices. Or it could be a hexagonal prism, in which case it has 12 vertices. There are other octahedraons.
An octahedron has eight bases/faces.
An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
The three main pyramids of Giza have base areas which sum to 110,120 square metres.
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