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1. ABCD  রম্বসের  ∠ABC =     120 °  এবং  O E ⊥ A B  হলে  ∠AOB   =   ?  

  • A. 30 °
  • B. 30 °
  • C. 30 °
  • D. 30 °

Answer: Option C

Explanation:

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