The length of a tangent from a point Q to a circle is 24 cm. The distance betwee

Question

The length of a tangent from a point Q to a circle is 24 cm. The distance between Q and the center of the circle is 25 cm. The radius of the circle is _____ cm.

Answer:
:

Given that PQ = 24 cm and OQ = 25 cm.
To find OP, applyPythagoras theorem for

△

OPQ.

{O P}^{2} + {Q P}^{2} = {O Q}^{2}

{O P}^{2} + 24^{2} = 25^{2}

{O P}^{2} = 625 - 576 = 49

\Rightarrow O P = 7 cm

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