Q. 85.0( 2 Votes )

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Answer :

PT is tangent to circle and OP is radius


OPT = 90° …radius is perpendicular to tangent


From figure


OPT = OPB + BPT


90° = OPB + 50° …BPT is 50° given


OPB = 40°


Hence OPB is 40°


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