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A B\ a n d\ C D are two parallel chor...

`A B\ a n d\ C D` are two parallel chords of a circle with centre `O` such that `A B=6\ c m\ a n d\ C D=12\ c mdot` The chords are on the same side of the centre and the distance between them is 3 cm. The radius of the circle is `6\ c m` (b) `5\ sqrt(2)\ c m` (c) `7\ c m` (d) `3\ sqrt(5)\ c m`

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