An octahedron is a 3D shape with 8 sides.
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octahedron
It is a regular octahedron.
A trapezoid is not a platonic solid. There are only five platonic solids. They are the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron.
It has 12. This solid has 8 sides, each of which is an equilateral triangle (in the case of the regular octahedron). Use the link and surf on over to Wikipedia to see a picture.
A shape with 8 faces is called an octahedron. An octahedron is a polyhedron with eight faces, each of which is an equilateral triangle. It is a three-dimensional shape that is commonly used in geometry and mathematics.