Cho điểm I nằm trên bán kính OE của đường tròn (O) và hai dây cung AB, CD gặp nhau tại I, trong đó CD ⊥ OI. Vẽ thêm bán kính OF ⊥ AB của đường tròn. Hãy so sánh độ dài AB với CD, IE với HF. Giúp mik với ;-;

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