Question 1141982
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The area of the circle O is


    {{{pi*r^2}}} = {{{81*pi}}};


hence,  {{{r^2}}} = 81  and  r= {{{sqrt(81)}}} = 9 units.


Then the radius of the circle P is  (9-2) = 7 units  and  its diameter is 2*7 = 14 units.    <U>ANSWER</U>
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