Declension of the word "Achteck"

Singular and plural for Achteck, n, strong declension     translation to English octagon

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Achteck
die Achtecke
Genitiv (Wessen?)
des Achteckes / Achtecks
der Achtecke
Dativ (Wem?)
dem Achteck / Achtecke
den Achtecken
Akkusativ (Wen? Was?)
das Achteck
die Achtecke
Plural
die Achtecke
der Achtecke
den Achtecken
die Achtecke
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