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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