七角反棱柱

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正七角反棱柱
七角反棱柱
類別 反棱柱
16
28
頂點 14
歐拉特徵數 F=16, E=28, V=14 (χ=2)
面的種類 三角形×14
正七邊形×2
面的佈局英语Face configuration 14{3}+2{7}
頂點圖英语Vertex figure 3.3.3.7
考克斯特符號英语Coxeter-Dynkin diagram CDel node h.pngCDel 2x.pngCDel node h.pngCDel 14.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 7.pngCDel node h.png
施萊夫利符號 s{2,7}
威佐夫符號英语Wythoff symbol | 2 2 7
康威表示法 A7
對稱群 D7d, [2+,14], (2*7), order 28
參考索引 U77(e)
對偶 七方偏方面體
Rotation group D7, [7,2]+, (722), order 14
特性
Heptagonal antiprism vertfig.png
3.3.3.7
(頂點圖)
120px
七方偏方面體
(對偶多面體)
120px
(展開圖)

在幾何學中,七角反棱柱又稱為反七角柱七角反柱是指底為七邊形反棱柱,側面由三角形組成,若每一個面皆為正多邊形則稱為正七角反棱柱。每個七角反棱柱皆含有16個面[1][2][3],是一種十六面體

正七角反棱柱是基底為正七邊形的七角反棱柱,其可視為一種半正多面體,在施萊夫利符號s{2,7}表示其可以藉由七邊形二面體透過扭稜變換構造。其具有D7對稱群[4],其在威佐夫符號英语Wythoff symbol中用| 2 2 7表示[5]

正七角反棱柱[编辑]

當底面為正七邊形時,會具備一些特別的性質

當基底邊長為a的時候:

高:\frac{1}{2}a\sqrt{4-\sec{\frac{\pi}{14}}\sec{\frac{\pi}{14}}}
表面積:\frac{7}{2}a^{2}(\cot{\frac{\pi}{7}}+\sqrt{3})
體積:\frac{7}{12}a^{3}(\cot{\frac{\pi}{14}}+\cot{\frac{\pi}{7}})\sqrt{1-\frac{1}{4}\sec{\frac{\pi}{14}}\sec{\frac{\pi}{14}}}

相關多面體與鑲嵌[编辑]

半正七邊形二面體球面多面體
對稱群英语List of spherical symmetry groups[7,2], (*722) [7,2]+, (722)
CDel node 1.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node.png CDel node 1.pngCDel 7.pngCDel node 1.pngCDel 2.pngCDel node.png CDel node.pngCDel 7.pngCDel node 1.pngCDel 2.pngCDel node.png CDel node.pngCDel 7.pngCDel node 1.pngCDel 2.pngCDel node 1.png CDel node.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node 1.png CDel node 1.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node 1.png CDel node 1.pngCDel 7.pngCDel node 1.pngCDel 2.pngCDel node 1.png CDel node h.pngCDel 7.pngCDel node h.pngCDel 2x.pngCDel node h.png
Heptagon.svg Regular tetradecagon.svg Heptagon.svg Spherical heptagonal prism.png Spherical heptagonal hosohedron.png Spherical truncated hexagonal prism.png Spherical heptagonal antiprism.png
{7,2} t{7,2} r{7,2} 2t{7,2}=t{2,7} 2r{7,2}={2,7} rr{7,2} tr{7,2} sr{7,2}
半正對偶
CDel node f1.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node.png CDel node f1.pngCDel 7.pngCDel node f1.pngCDel 2.pngCDel node.png CDel node.pngCDel 7.pngCDel node f1.pngCDel 2.pngCDel node.png CDel node.pngCDel 7.pngCDel node f1.pngCDel 2.pngCDel node f1.png CDel node.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node f1.png CDel node f1.pngCDel 7.pngCDel node.pngCDel 2.pngCDel node f1.png CDel node f1.pngCDel 7.pngCDel node f1.pngCDel 2.pngCDel node f1.png CDel node fh.pngCDel 7.pngCDel node fh.pngCDel 2x.pngCDel node fh.png
Spherical heptagonal hosohedron.png Spherical dodecagonal hosohedron.png Spherical heptagonal hosohedron.png Spherical hexagonal bipyramid.png Heptagon.svg Spherical heptagonal bipyramid.png Spherical dodecagonal bipyramid.png Spherical heptagonal trapezohedron.png
V72 V142 V72 V4.4.7 V27 V4.4.7 V4.4.14 V3.3.3.7
半正反棱柱系列
2 3 4 5 6 7 8 9 10 11 12 n
s{2,4}
sr{2,2}
s{2,6}
sr{2,3}
s{2,8}
sr{2,4}
s{2,10}
sr{2,5}
s{2,12}
sr{2,6}
s{2,14}
sr{2,7}
s{2,16}
sr{2,8}
s{2,18}
sr{2,9}
s{2,20}
sr{2,10}
s{2,22}
sr{2,11}
s{2,24}
sr{2,12}
s{2,2n}
sr{2,n}
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 4.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 2x.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 6.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 3.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 8.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 4.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 1x.pngCDel 0x.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 5.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 1x.pngCDel 2x.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 6.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 1x.pngCDel 4.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 7.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 1x.pngCDel 6.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 8.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 1x.pngCDel 8.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 9.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 2x.pngCDel 0x.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 10.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 2x.pngCDel 2x.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 11.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 2x.pngCDel 4.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 12.pngCDel node h.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel 2x.pngCDel n.pngCDel node.png
CDel node h.pngCDel 2x.pngCDel node h.pngCDel n.pngCDel node h.png
Digonal antiprism.png Trigonal antiprism.png Square antiprism.png Pentagonal antiprism.png Hexagonal antiprism.png Antiprism 7.png Octagonal antiprism.png Enneagonal antiprism.png Decagonal antiprism.png Hendecagonal antiprism.png Dodecagonal antiprism.png
作為球面鑲嵌
Spherical digonal antiprism.png Spherical trigonal antiprism.png Spherical square antiprism.png Spherical pentagonal antiprism.png Spherical hexagonal antiprism.png Spherical heptagonal antiprism.png Spherical octagonal antiprism.png

在其他領域中[编辑]

參見[编辑]

參考文獻[编辑]

  1. ^ Pugh, Anthony, Polyhedra: A Visual Approach, University of California Press, 21, 27, 62, 1976, ISBN 9780520030565 .
  2. ^ heptagonal antiprism vertices wolframalpha.com [2014-06-22]
  3. ^ net of heptagonal antiprism korthalsaltes.com [2014-06-22]
  4. ^ Melnyk, Theodor William, Osvald Knop, and William Robert Smith. "Extremal arrangements of points and unit charges on a sphere: equilibrium configurations revisited." Canadian Journal of Chemistry 55.10 (1977): 1745-1761.
  5. ^ Heptagonal prisms and antiprisms umanitoba.ca [2014-6-22]
  6. ^ {7}-antiprism antiprism.com [2014-6-22]
  7. ^ Heptagonal Antiprism dmccooey.com [2014-6-22]
  • Fowler, P. W., T. Tarnai, and Zs Gáspár. "From circle packing to covering on a sphere with antipodal constraints." Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 458.2025 (2002): 2275-2287.
  • heptagonal antiprism rediff.com [2014-6-22]

外部連結[编辑]