document.write( "Question 815575: The sum of radii of two circles is 10.5 cm and the difference of their circumferences is 13.2 cm. Find the radii of the two circles. \n" ); document.write( "

Algebra.Com's Answer #491074 by TimothyLamb(4379) $\"\"$ $\"About$

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c = 2pi*r
\n" ); document.write( "---
\n" ); document.write( "m = radius of smaller circle
\n" ); document.write( "n = radius of larger circle
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\n" ); document.write( "m + n = 10.5
\n" ); document.write( "m = 10.5 - n
\n" ); document.write( "2pi*n - 2pi*m = 13.2
\n" ); document.write( "---
\n" ); document.write( "2pi*n - 2pi*m = 13.2
\n" ); document.write( "n - m = 13.2/2pi
\n" ); document.write( "n - m = 2.1008452
\n" ); document.write( "n - (10.5 - n) = 2.1008452
\n" ); document.write( "n - 10.5 + n = 2.1008452
\n" ); document.write( "2n = 12.600845
\n" ); document.write( "---
\n" ); document.write( "n = 6.3004226
\n" ); document.write( "m = 4.1995774
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