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Multiple choice

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 $n$.

  1. $18$
  2. $10$
  3. $20$
  4. $12$
Reveal answer Fill a bubble to check yourself
C Correct answer

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