# If the rate of change of volume of a sphere is equal to the rate of change of its radius, find the radius of the sphere.

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If the rate of change of volume of a sphere is equal to the rate of change of its radius, find the radius of the sphere.

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We have,

$\frac{dV}{dt}=\frac{dr}{dt},$

Where V is the volume and r is the radius of the sphere