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Answer:

The radius of the circle is 9.

Step-by-step EXPLANATION:

QO is the radius.

As PQ is a tangent, the angle PQO is 90°

So, by using pythagoras theoram,

QO^{2} = OP^{2} - PQ^{2}

QO = \sqrt{15^{2} -12^{2} }

QO = 9

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