One disk of 20cm radius, out of that 4 disk of 5cm are cut, find difference of left out and cut out area?

200pi

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priyanka_m

  • Nov 16th, 2006
 

the answer is 200 pi,

total areal of big disc = pi r square = pi * 20 * 20 = 400 pi

total cut out area = 4 * pi * 5 * 5 = 100 pi

difference between them = 200 pi

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