Answer :


Assertion (A) :


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


Construction: Draw, L is the midpoint of AB


Here,


OA = 10cm


AL = AB = 8cm


In ΔOAL,


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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