Answers

2016-02-03T21:08:27+05:30
(πr1^2-πr2^2)×2.5÷10000
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2016-02-03T22:07:32+05:30
22/7 [ (18 ) ^2 - (11)^2]  = area of ring

22/7 x 203 
 = 22 x 29 
 = 638cm^2



cost = 638 x 2.50 /10000
        = 1595/10000
         = 0.1595 RS
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