document.write( "Question 1070878: find the area of a circular ring formed by the circumference of two concentric circles of raddii 11m and 4 m. also find the cast of painting this ring at the rate of Rs. 21 per m sq. \n" ); document.write( "

Algebra.Com's Answer #685889 by Fombitz(32388) $\"\"$ $\"About$

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The area is,
\n" ); document.write( " $\"A=pi%2A%28R%5B2%5D%5E2-R%5B1%5D%5E2%29\"$
\n" ); document.write( " $\"A=pi%2A%2811%5E2-4%5E2%29\"$
\n" ); document.write( " $\"A=pi%2A%28121-16%29\"$
\n" ); document.write( " $\"A=105%2Api\"$ $\"m%5E2\"$
\n" ); document.write( "The cost would be,
\n" ); document.write( " $\"C=105pi%2A21\"$
\n" ); document.write( "Work that out for a final answer. \n" ); document.write( "

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