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What polyhedron has eight sides and all of the are equilateral triangle?

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octahedron

Q: What polyhedron has eight sides all of the faces are equilateral triangles and all of the faces are the same?

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An octahedron.

tetrahedron

An octahedron is a polyhedron with eight faces. A regular octahedron can be composed of eight equilateral triangles, four forming each half, and meeting in the middle at a square. Imagine a pyramid, with a square base. Rising up from each edge is an equilateral triangle that meets the other four triangles at the apex. Now, turn the pyramid over and add four more triangles to the other side the same way. You now have an octahedron. For more information, and a rotating picture, please see the related link below.

The minimum numbers of congruent faces are as follows: On an equilateral triangular prism: one pair of triangles On a right equilateral triangular prism: one pair of triangles and one triplet of rectangles.

A polyhedron of which one face is a square, and the other faces are triangles with a common vertex.

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