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Увійдіть до Mathigon

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Polygons and PolyhedraPlatonic Tetrahedron

If we create a polyhedron where three equilateral triangles

An equilateral triangle is a triangle in which all three sides have the same length.

meet at every vertex, we get the shape on the left. It is called a Tetrahedron and has faces. (“Tetra” means “four” in Greek).

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