ABCDE is a regular pentagon with sides of length $6$ cm. CD is also a side of a regular polygon with n sides. Given that $\angle EDF=90^{\circ}$, find $n$.
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ABCDE is a regular pentagon with sides of length $6$ cm. CD is also a side of a regular polygon with n sides. Given that $\angle EDF=90^{\circ}$, find $n$.