Q. 245.0( 1 Vote )

# B. surface area times the rate of change of diameter

C. surface area times the rate of change of radius

D. none of these

Answer :

The volume and surface area of a sphere, with radius r, is defined as

- (1) and A(r)=4πr^{2}

Differentiating (1) with respect to t, we get

=(Surface area of a sphere)×(rate of change of radius)

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