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Let A B and C D are two parallel chords ...

Let `A B` and `C D` are two parallel chords of circle whose radius is 5 units. If `P` and `Q` are mid points of `A B` and `C D` respectively such that `P A . P B=9, Q C . Q D=16`, then distance betweẹn `A B` and `C D` is

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