document.write( "Question 1132551: two concentric circles with centre O and radius r and R respectively. if R=3r, express the area of the shaded part in terms of π and r \n" ); document.write( "

Algebra.Com's Answer #749626 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "I assume that the shaded area is between the circles.\r\n" );
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document.write( "Then its area is   -  =  -  =  -  = .     ANSWER\r\n" );
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