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Editor
 Sep 18, 2022
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Ripples in shape of circles are produced when a stone is thrown in water. If the rate of change of circumference of these circles is $12\pi$, what is the rate of change of area of the circle when the radius is 3cm
Difficulty: Easy
A: 
$28\pi$
B: 
$36\pi$
C: 
$54\pi$
D: 
$60\pi$
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NETNUST Entry TestMathematicsDifferentiation