Which types of polygons are the faces of a octahedron?

Each face of an octahedron is an equilateral triangle.

An octahedron is a three-dimensional solid (polyhedron) that has eight faces.

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Triangles

Step-by-step explanation:

If you look up octahedron, you can see that triangles make up the faces of an octahedron.

the square root of what number? if you add that, then someone will probably answer the question.