Reguläres n-Eck/Monotonie des Flächeninhalts/Aufgabe

Zu

{}n\geq 3

sei

{}A_{n}

der Flächeninhalt eines in den Einheitskreis eingeschriebenen gleichmäßigen

{}n

-Eckes. Zeige

{}A_{n}\leq A_{n+1}

.

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