| 41. | The castle is distinguished by two towers, one quadrangular and one pentagonal.
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| 42. | The building's shape was pentagonal, with bastions along the perimeter.
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| 43. | The middle apse is rounded on the inside and pentagonal on the outside.
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| 44. | It is not clear why a pentagonal shape was chosen for the building.
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| 45. | A pentagonal activity room opens into two adjoining rooms beyond the kitchen area.
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| 46. | It has a cross layout with open rafters and vaulted, pentagonal chancels.
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| 47. | In 1513 a pentagonal apse with gothic columns was added to the upper chapel.
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| 48. | The centered pentagonal number for " n " is given by the formula
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| 49. | The pentagonal antiprism occurs as a constituent element in some higher-dimensional polytopes.
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| 50. | Found the first five types of pentagonal tile.
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