If the radius of the circle changes at the rate of −2/\pi m/sec, at what rate does the circle's area change when the radius is 10 m?

Correct Answer is : -40 m2∕sec

UPSC NDA Math Model Paper 2

Question : 16 of 120

Marks: +1, -0

If the radius of the circle changes at the rate of −

m/sec, at what rate does the circle's area change when the radius is 10 m?

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