Answer :

Assertion (A) :

Let O be the centre of the circle and AB be the chord

Construction: Draw, L is the midpoint of AB


OA = 10cm

AL = AB = 8cm


OL2 = OA 2 – AL2

OL2 = (10)2 – (8) 2

OL2 = 100 – 64

OL = = 6cm

Thus, Assertion (A) is true.

Clearly, reason (R) given Assertion (A).

Hence, the correct choice is A.

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