In geometry, an icosahedron (/ ˌaɪkɒsəˈhiːdrən, - kə -, - koʊ -/ or / aɪˌkɒsəˈhiːdrən / [1]) is a polyhedron with 20 faces. The name comes from Ancient Greek εἴκοσι (eíkosi) 'twenty' and …

The icosahedron's definition is derived from the ancient Greek words Icos (eíkosi) meaning 'twenty' and hedra (hédra) meaning 'seat'. It is one of the five platonic solids with equilateral …

For a regular icosahedron (where all faces are equilateral triangles): The name icosahedron comes from the Greek icosa- meaning 20, because it is a polyhedron with 20 faces. When we …

What is an icosahedron An icosahedron is a three-dimensional figure made up of only polygons. One real life icosahedron example is a 20-sided die, also referred to as D20: The 20-sided die …

Aug 30, 2023 · The icosahedron is distinguished from the other regular polyhedra in that it has an irrational volume both in tetrahedra and cubes. Its isolation is further reinforced by its axes of …

An icosahedron is a three-dimensional geometric shape, specifically a polyhedron, that has exactly 20 faces. In its most common form, the regular icosahedron, all faces are identical …

An icosahedron is a regular polyhedron that has 20 faces. All the faces are equilateral triangles and are all congruent, that is, all the same size. It is one of the five Platonic solids.

An icosahedron has 30 edges—the angle between the edges of an icosahedron measures 60°. The corners of an icosahedron, where the faces meet, are called vertices.

Dec 3, 2025 · The (general) icosahedron is a 20-faced polyhedron (where icos- derives from the Greek word for "twenty" and -hedron comes from the Indo-European word for "seat").

Oct 31, 2025 · icosahedron (plural icosahedra or icosahedrons) (geometry) A polyhedron with twenty faces. (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of …