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                                    6).From a circular sheet of radius 4 cm, a circle of radius 3 cm is removed. Find the area of the remaining sheet. (take `pi=22/7`)(7).Saima wants to put a lace on the edge of a circular table cover of diameter 1.5 m. Find thelength of the lace required and also find its cost if one meter of the lace costs ₹15.(take `pi=22/7`) | 
                            
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Answer» area of 4 cm sheet `= pi(4)^2 ` `= 16 pi` area of 3 cm sheet`= pi(3)^2 = 9 pi` remaining area `= 16 pi - 9 pi` `= 7 pi = 7 xx 3.14` `= 21.98 cm^2` answer  | 
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