Answer :


Given PQ = 4cm, Distance from the Center is 2,1cm


PQ = 2 PD


Perpendicular from the center of the circle to any Chord bisects it in two line segments



PD


PD = 2cm


In O PD , Using Pythagoras Theorem


OD2 + PD 2 = OP2


OP2 = 2.12 + 22


OP2 = 8.41


OP = 2.9cm


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