P is a point out side a circle, which is...

P is a point out side a circle, which is 13 cm from the centre. A line drawn from point P intersects the circle at point A and B such that PA = 9 cm and AB = 7 cm. Then find the radius of the circle.

a)5 cm

b)4 cm

c)4.5 cm

d)5.5 cm

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