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- In geometry, the enneagonal antiprism (or nonagonal antiprism) is one in an infinite set of convex antiprisms formed by triangle sides and two regular polygon caps, in this case two enneagons. Antiprisms are similar to prisms except the bases are twisted relative to each other, and that the side faces are triangles, rather than quadrilaterals. In the case of a regular 9-sided base, one usually considers the case where its copy is twisted by an angle 180°/n. Extra regularity is obtained by the line connecting the base centers being perpendicular to the base planes, making it a right antiprism. As faces, it has the two n-gonal bases and, connecting those bases, 2n isosceles triangles. If faces are all regular, it is a semiregular polyhedron. (en)
- Geometrian, antiprisma eneagonala oinarritzat bi eneagono (berdinak, baina bata bestearekiko biraturik) eta albo-aurpegitzat triangeluak dituen poliedroa da. Oinarri baten erpin bat haren parean beste oinarrian dauden ondoz ondoko bi erpinak lotzean sortzen dira albo-aurpegi triangeluarrak. Adibidez, bi oinarriak eneagonoak dituen prisma batean (bi oinarriek zentro bera dute, baina bata bestearekiko 20° edo π/9 radian biratuta dago), bi oinarrien hamazortzi erpinak lotzen dituzten hogeita hamabi ertz daude eta irudiak, beraz, hamalau albo-alde triangeluar ditu: antiprisma oktogonal simetriko bat da. (eu)
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- 1311 (xsd:nonNegativeInteger)
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- Geometrian, antiprisma eneagonala oinarritzat bi eneagono (berdinak, baina bata bestearekiko biraturik) eta albo-aurpegitzat triangeluak dituen poliedroa da. Oinarri baten erpin bat haren parean beste oinarrian dauden ondoz ondoko bi erpinak lotzean sortzen dira albo-aurpegi triangeluarrak. Adibidez, bi oinarriak eneagonoak dituen prisma batean (bi oinarriek zentro bera dute, baina bata bestearekiko 20° edo π/9 radian biratuta dago), bi oinarrien hamazortzi erpinak lotzen dituzten hogeita hamabi ertz daude eta irudiak, beraz, hamalau albo-alde triangeluar ditu: antiprisma oktogonal simetriko bat da. (eu)
- In geometry, the enneagonal antiprism (or nonagonal antiprism) is one in an infinite set of convex antiprisms formed by triangle sides and two regular polygon caps, in this case two enneagons. Antiprisms are similar to prisms except the bases are twisted relative to each other, and that the side faces are triangles, rather than quadrilaterals. If faces are all regular, it is a semiregular polyhedron. (en)
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- Antiprisma eneagonal (eu)
- Enneagonal antiprism (en)
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