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The diameters of 3 different circles, which have a common

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Senior Manager
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The diameters of 3 different circles, which have a common [#permalink] New post 06 May 2006, 03:06
The diameters of 3 different circles, which have a common centre, are 8, 20, and 40 respectively. The region between the little circle and the middle circle is shaded. The area of the shaded region is what fraction of the big circle?
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 [#permalink] New post 06 May 2006, 03:15
getzgetzu, it's good that you post all those QS :)

Area of little-16pi
area of middle-100pi
area of big-400pi
area of shaded region-100pi-16pi=84pi
Ratio required 84pi/400pi=21/100
Regards
  [#permalink] 06 May 2006, 03:15
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The diameters of 3 different circles, which have a common

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