self Maths Puzzle

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

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self Other Question

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 A watch is sold at a profit of 30% had it been slod for Rs 80less, there would have been a loss of 10%. what is the cost price in rupees