Answer :

Clearly, reason (R) is true.

Assertion (A) :

OA = 13cm

OL = 12cm

In ΔOAL,

AL^{2} = OA^{2} – OL^{2}

AL^{2} = (13)^{2} – (12)^{2}

AL^{2} = 169 – 144

OL = = 5cm

Now, AB = 2 × AL = 2 × 5 = 10cm

Thus, Assertion (A) is true

∴ Reason (R) and Assertion (A) are both true but reason (R) does not gives Assertion (A).

Hence, correct choice is B

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