Icosahedron facts for kids
An icosahedron is a Platonic solid that is made of triangles and has twenty sides.
Images for kids
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Construction from the vertices of a truncated octahedron, showing internal rectangles.
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Progressions between an octahedron, pseudoicosahedron, and cuboctahedron. The cuboctahedron can flex this way even if its edges (but not its faces) are rigid.
See also
In Spanish: Icosaedro para niños
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Icosahedron Facts for Kids. Kiddle Encyclopedia.