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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