document.write( "Question 1141982: Circle O (not shown) has an area of 81π square units. Circle P had a radius that is 2 units shorter than the radius of circle O . What is the diameter of circle P? \n" ); document.write( "
Algebra.Com's Answer #762631 by Boreal(15235)\"\" \"About 
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area is pi*r^2
\n" ); document.write( "81*pi=r^2
\n" ); document.write( "r^2=81
\n" ); document.write( "r=9 units\r
\n" ); document.write( "\n" ); document.write( "circle of radius of 7 units would have an area of pi*7^2=49pi square units
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