Bentagoon
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Bentagoonku waa shaxdhow aad u dhow, waxaana uu ku salaysan yahay shan noocood oo qodob, oo dhammaantood ku jira seddex. Haddii dhinacyada dhammaan ay leeyihiin sama dhow oo ku nool 108°, bentagoonku waa loo yiqiin "midab-ka-dhexeeya". Haddii bentagoonku wuxuu la dhoobiyaa hal-abuuris, waxaana lagu yiqiin "bentagaram".
![](http://178.128.105.246/cars-http-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