PT is tangent to circle and OP is radius
⇒ ∠OPT = 90° …radius is perpendicular to tangent
⇒ ∠OPT = ∠OPB + ∠BPT
⇒ 90° = ∠OPB + 50° …∠BPT is 50° given
⇒ ∠OPB = 40°
Hence ∠OPB is 40°
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