regular pentagon (Q7812)

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convex regular polygon with 5 sides

pentagon
regular 5-gon
5-gon

Language	Label	Description	Also known as
English	regular pentagon	convex regular polygon with 5 sides	pentagon regular 5-gon 5-gon

Statements

equilateral pentagon

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regular convex polygon

regular hexagon

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constructible polygon

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dodecahedral pentagonal polytope

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icosahedral pentagonal polytope

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equidiagonal pentagon

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defining formula

P=5a

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area of plane shape

defining formula

A={\frac {5}{4}}t^{2}\mathop {\mathrm {ctg} } \,{\frac {\pi }{5}}={\frac {{\sqrt {5}}{\sqrt {5+2{\sqrt {5}}}}}{4}}t^{2}={\frac {5}{12}}Rd

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defining formula

r={\frac {t}{2\tan(\pi /5)}}={\frac {t}{2{\sqrt {5-{\sqrt {20}}}}}}

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defining formula

R={\frac {a}{2}}\csc {\frac {\pi }{5}}

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Sitelinks

⧼wikibase-sitelinks-mywikigroup⧽(0 entries)

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