self Maths Puzzle

P is a point outside a circle and is 13cm away from its centre. A secant drawn from the point P intersects the circle at points A and B in such a way that PA=9cm and AB=7cm. the radius of the circle is

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self Other Question

The perimeter of two similar triangles ABC and PQR are 36cm and 24cm respectively. If PQ=10cm, then AB is R and r are the radius of two circles (R>r). If the distance between the centre fo the two circles be d, then length of common tangent of two circles is