Quantitative Aptitude Geometry Circles, Chords and Tangents

The length of the tangent to a circle from a point P, is 17 cm. Point P is 20 cm away from the centre. What is the radius of the circle? 

1
\(\sqrt {111} \;cm\)
2
\(\sqrt {121} \;cm\)
3
\(\sqrt {126} \;cm\)
4
\(\sqrt {131} \;cm\)

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