Find the value of CD?

4 cm

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6 cm

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9 cm

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12 cm

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Solution

The correct option is B
6 cm

Joint point A to C and B to C

So, $A D \times B D = C D^{2}$ (The diameter of a circle bisects the chord)

$∴ C D^{2} = 18 \times 2$

$C D^{2} = 36$

CD =6 cm

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