Bentagoon
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Bentagoonkuwaashaxdhowaad u dhow, waxaana uu ku salaysan yahay shan noocood oo qodob, oo dhammaantood ku jira seddex. Haddii dhinacyada dhammaan ay leeyihiin samadhowoo ku nool108°,bentagoonku waa loo yiqiin "midab-ka-dhexeeya". Haddii bentagoonku wuxuu la dhoobiyaa hal-abuuris, waxaana lagu yiqiin "bentagaram".
![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Regular_polygon_5_annotated.svg/220px-Regular_polygon_5_annotated.svg.png)
Foomamka
[wax ka badal|wax ka badal xogta]Aagga
[wax ka badal|wax ka badal xogta]A = (5/4) × s² × (1 / tan(π/5))
Wareega
[wax ka badal|wax ka badal xogta]W = 5 × s