Drawing 2024-01-26 10.36.25.excalidraw

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8-Eck

Fürs 8-Eck:

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88c3e42c4a924c3e22e6035b755198ea999ed6e3: $\frac{8\ast 5}{2}=20$ 7cdfa19f945ab72dab53b9e07fd57b7d7c98e490: $\frac{n\ast (n-3)}{2}$