Answer :

We know that tangent to a circle makes a right angle with radius.

∠OPQ = 90°

Applying Pythagoras

PQ^{2} = OP^{2} + OQ^{2}

PQ^{2} = 9^{2} + 15^{2}

PQ^{2} = 81 + 225

PQ^{2} = 306

PQ = cm

Length of tangent = cm

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