| 11. | The redoubt consists of a pentagonal platform with a low parapet.
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| 12. | Following this is a smaller pentagonal tower, crowned with machialliations.
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| 13. | An icosahedron can also be called a gyroelongated pentagonal bipyramid.
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| 14. | The Dhammayazika and the Ngamyethna Pagoda are examples of the pentagonal design.
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| 15. | Generalized pentagonal numbers are closely related to centered hexagonal numbers.
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| 16. | Two of every three pentatope numbers are also pentagonal numbers.
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| 17. | It can be constructed as a rhombicosidodecahedron with three pentagonal cupolae removed.
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| 18. | The figures are bronze plated and attached to a pentagonal base plate.
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| 19. | It has the same vertex arrangement as the pentagonal antiprism.
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| 20. | The pentagonal prisms are joined to each other via their square faces.
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