A circle with radius 5cm has its radius increasing at the...
A circle with radius 5cm has its radius increasing at the rate of 0.2m/s. What will be the corresponding increase in the area?
2π
5π
π
4π
Correct answer is A
Area of the circle (A) = πr2
dAdr=2πr
dAdt=dAdr.drdt
dAdt=2π×5×0.2=2π
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