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Rhombohedron
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<table><tbody><tr><th colspan="2">Rhombohedron</th></tr><tr><td colspan="2"></td></tr><tr><td>Type</td><td><a href="/facts/Prism_(geometry)/baIRRkCy">prism</a></td></tr><tr><td>Faces</td><td>6 <a href="/facts/Rhombus/T4pU50GF">rhombi</a></td></tr><tr><td>Edges</td><td>12</td></tr><tr><td>Vertices</td><td>8</td></tr><tr><td><a href="/facts/List_of_spherical_symmetry_groups/3X3YcHoQ">Symmetry group</a></td><td><a href="/facts/Cyclic_symmetries/wQUCezbQ"><i>C</i><i>i</i></a> , [2+,2+], (×), order 2</td></tr><tr><td>Properties</td><td><a href="/facts/Convex_set/vdAuJRJl">convex</a>, <a href="/facts/Equilateral_polygon/SEUzU3uS">equilateral</a>, <a href="/facts/Zonohedron/w16kH9H3">zonohedron</a>, <a href="/facts/Parallelohedron/4B0xFmsg">parallelohedron</a></td></tr></tbody></table> <p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, a rhombohedron (also called a rhombic hexahedron or, inaccurately, a rhomboid) is a special case of a <a href="/facts/Parallelepiped/Qn7cDgSr">parallelepiped</a> in which all six faces are congruent <a href="/facts/Rhombus/T4pU50GF">rhombi</a>. It can be used to define the <a href="/facts/Rhombohedral_lattice_system/sSSok8wo">rhombohedral lattice system</a>, a <a href="/facts/Honeycomb_(geometry)/seyRBcel">honeycomb</a> with rhombohedral cells. A rhombohedron has two opposite <a href="/facts/Apex_(geometry)/SrMxmHJk">apices</a> at which all face angles are equal; a prolate rhombohedron has this common angle acute, and an oblate rhombohedron has an obtuse angle at these vertices. A <a href="/facts/Cube/65lUaAqN">cube</a> is a special case of a rhombohedron with all sides <a href="/facts/Square/JHJeMvmL">square</a>. </p>