Answer :

given that circumference is = C = 2πr = 28 cm

That’s mean r=14/π


ΔC = 2πΔr = 0.01


Δr = (0.01/2π)


We all know that area of a circle is = A =πr2


ΔA= 2πr×dr


So finally,



= 1/14

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