Hello Jyoti,



If the radius of the circle is increased by 10%, the area is of the circle which is calculated using the formula:



area = pi x r x r



Now consider the radius as 2 cm,



The area is 3.14 x 4 = 12.56 cm^2.



Now if radius is increased by 10%, i.e. it becomes 2.2 cm,



The area becomes 3.14 x 4.84 = 15.20 cm^2.



Thus the area increases by 21%.



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