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P is an external point of a circle. A li...

P is an external point of a circle. A line drawn from 'E' intersects the circle at 'C' and 'D . P C=9', PA '=6' fand 'O' is the centre of the circle. If the shortest distance from 'P' to the circle is equal to. the radius of the circle.
a) What is the radius of the circle?
b) Compute CD.

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