In the figure, the radii of two concentric circles with centre O are 5cm and 3cm P A and P B are tangents to these circles. If P A=12cm. Find BP Q. There are two cocentric circles with centre O of radii 5cm and 2cm. From an external point P, tangents P A & P B are drawn to these circles.

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Two circles will touch if the distance between their centres, \(d\), is equal to the sum of their radii, or the difference between their radii. Two circles will intersect at two points when \({r_1.