Q. 94.6( 5 Votes )

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Answer :

The angle between tangent and radius is 90°.

Also OCB=90°


AC=1/2 AB(Perpendicular from center bisects chord(AB) of the circle)

AC= 1/2 (48)=24cm

Now we consider the right-angled triangle OAC,

(OA)2=(OC)2 + (AC)2

(r)2=(7)2 + (24)2 =625

r= 625 =25cm

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